150 Sentences with LEST in English

The word “lest” is a formal conjunction in English used to express fear or prevention, meaning “so that something bad does not happen.”

It is often found in written English, exams, and advanced grammar topics, but many learners find it confusing.

Learning sentences with “lest” helps students understand formal English and use complex sentence structures correctly.

This blog post, “150 Sentences with LEST in English,” is specially created for students, competitive exam learners, and ESL learners.

In this post, you will find clear and practical English sentences using “lest” to show caution, fear, or prevention.

These examples will help you understand the correct structure and improve your grammar, writing, and comprehension skills.

This topic is part of our English Sentences for English learners.

✅ Everyday Situations

1. Speak softly lest you wake the baby.

2. I hurried lest I be late for school.

3. She studied hard lest she fail the exam.

4. He ran quickly lest he miss the train.

5. Close the window lest the rain come in.

6. Carry an umbrella lest it rain.

7. Take notes lest you forget the lesson.

8. Wear warm clothes lest you catch a cold.

9. Walk carefully lest you slip.

10. Save money lest you face trouble later.

✅ Work & Study

11. Revise the chapter lest you forget.

12. He double-checked his answer lest it be wrong.

13. They practiced daily lest they lose the match.

14. She took extra time lest she make mistakes.

15. I kept quiet lest the teacher scold me.

16. He prepared well lest he fail the interview.

17. She avoided chatting lest she lose focus.

18. He left early lest he be marked absent.

19. I checked the form twice lest I miss something.

20. They rehearsed lest the play go badly.

✅ Safety & Warnings

21. Drive slowly lest you cause an accident.

22. Hold the railing lest you fall.

23. Wear a helmet lest you get injured.

24. He stayed inside lest the storm harm him.

25. Put out the fire lest it spread.

26. Lock the door lest someone enter.

27. Wash your hands lest you get sick.

28. Stay away lest you be hurt.

29. Be cautious lest you lose your wallet.

30. He whispered lest anyone overhear.

✅ Emotions & Feelings

31. She hid her tears lest he notice.

32. He avoided smiling lest they mock him.

33. She looked away lest he see her blush.

34. I spoke gently lest she be offended.

35. He kept silent lest anger show.

36. She dressed neatly lest people judge her.

37. He lowered his voice lest others laugh.

38. She avoided eye contact lest he read her mind.

39. I stayed calm lest panic spread.

40. He laughed lightly lest they think he was serious.

✅ Formal / Literary Style

41. Pray daily lest you fall into temptation.

42. Work hard lest your talents go to waste.

43. Speak kindly lest harsh words wound a soul.

44. Guard your thoughts lest evil enter.

45. Respect elders lest you lose blessings.

46. Be humble lest pride destroy you.

47. Act wisely lest you regret later.

48. Choose friends carefully lest they mislead you.

49. Save time lest life pass in vain.

50. Seek knowledge lest ignorance rule you.

✅ Historical / Speech-Like

51. Let us remember their sacrifice lest we forget.

52. Keep the flame burning lest darkness prevail.

53. Cherish freedom lest tyranny return.

54. Honor heroes lest their deeds be in vain.

55. Be vigilant lest history repeat itself.

56. Protect nature lest future generations suffer.

57. Preserve peace lest war come again.

58. Value truth lest falsehood triumph.

59. Unite lest division weaken us.

60. Speak out lest injustice continue.

✅ Travel & Daily Life

61. Pack food lest you feel hungry.

62. Take extra fuel lest the car stop.

63. Carry cash lest the card fail.

64. Charge your phone lest the battery die.

65. Wear shoes lest your feet hurt.

66. Note the address lest you get lost.

67. Bring water lest you feel thirsty.

68. Carry medicines lest you fall sick.

69. Keep the map lest GPS not work.

70. Buy tickets early lest they sell out.

✅ Love & Relationships

71. She lowered her eyes lest he read her heart.

72. He spoke softly lest she feel hurt.

73. She wrote carefully lest he misunderstand.

74. He stayed away lest she think him too eager.

75. She hid her feelings lest he reject her.

76. He kept silent lest she get angry.

77. She avoided words lest they quarrel.

78. He smiled gently lest she feel ignored.

79. She stayed calm lest he worry.

80. He sent flowers lest she feel forgotten.

✅ Polite Advice

81. Hurry lest you be late.

82. Listen carefully lest you miss the point.

83. Write it down lest you forget.

84. Follow instructions lest mistakes happen.

85. Work together lest you fail.

86. Be patient lest you spoil everything.

87. Stay focused lest you lose track.

88. Read again lest you misunderstand.

89. Prepare early lest you rush.

90. Speak clearly lest others be confused.

✅ Negative Situations

91. He avoided them lest they harm him.

92. She hid the truth lest he be angry.

93. He turned away lest he be tempted.

94. She stopped talking lest secrets slip.

95. He ran away lest he be caught.

96. She left quietly lest anyone notice.

97. He changed his path lest trouble arise.

98. She closed the book lest he ask questions.

99. He deleted the file lest someone see it.

100. She whispered lest they hear.

✅ Extended Variety

101. He shut the window lest mosquitoes enter.

102. She covered the food lest flies sit on it.

103. He stood guard lest thieves attack.

104. She planted trees lest soil erode.

105. He watered plants lest they dry.

106. She cooked more lest guests come.

107. He cleaned the house lest mother scold him.

108. She ironed clothes lest they look messy.

109. He wore gloves lest his hands freeze.

110. She put salt lest the dish taste bland.

✅ Professional Life

111. He saved documents lest the system crash.

112. She set reminders lest she forget deadlines.

113. He worked late lest the project delay.

114. She cross-checked accounts lest errors remain.

115. He joined training lest his skills weaken.

116. She kept backups lest data be lost.

117. He replied fast lest the client complain.

118. She dressed formally lest she look unprofessional.

119. He stayed quiet lest the boss get angry.

120. She smiled lest colleagues feel ignored.

✅ Big List Completion (121–150)

121. Stay indoors lest the storm harm you.

122. Bring a jacket lest it get cold.

123. Carry ID lest police ask.

124. Lock your phone lest it be stolen.

125. Save drafts lest your work vanish.

126. Drink water lest you faint.

127. Wash fruits lest you get ill.

128. Rest well lest you fall sick.

129. Drive slowly lest the road be slippery.

130. Be honest lest lies ruin trust.

131. Train daily lest your skills fade.

132. Pay attention lest you miss details.

133. Eat early lest you feel heavy.

134. Sleep early lest you be tired.

135. Take care lest accidents happen.

136. Keep trying lest you give up.

137. Watch your words lest they hurt.

138. Work hard lest dreams remain dreams.

139. Respect rules lest chaos come.

140. Help others lest they lose hope.

141. Follow law lest you be punished.

142. Stay alert lest danger come.

143. Protect books lest knowledge vanish.

144. Love family lest regret come later.

145. Speak truth lest lies be exposed.

146. Obey teachers lest you fail.

147. Use time wisely lest it be wasted.

148. Value health lest illness take over.

149. Treasure friendship lest it be lost.

150. Live fully lest life slip away.