Synonym: debilitated, feeble, fragile, impotent, powerless. Antonym: robust, strong. Similar words: weaken, wean, wear, swear, weary, weave, sweat, weather. Meaning: [wɪːk] 
adj. 1. having little physical or spiritual strength 2. overly diluted; thin and insipid 3. used of vowels or syllables; pronounced with little or no stress 4. having the attributes of man as opposed to e.g. divine beings 5. tending downward in price 6. deficient or lacking in some skill 7. lacking physical strength or vitality 8. (used of verbs) having standard (or regular) inflection 9. not having authority, political strength, or governing power 10. deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc 11. likely to fail under stress or pressure 12. deficient in intelligence or mental power.
adj. 1. having little physical or spiritual strength 2. overly diluted; thin and insipid 3. used of vowels or syllables; pronounced with little or no stress 4. having the attributes of man as opposed to e.g. divine beings 5. tending downward in price 6. deficient or lacking in some skill 7. lacking physical strength or vitality 8. (used of verbs) having standard (or regular) inflection 9. not having authority, political strength, or governing power 10. deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc 11. likely to fail under stress or pressure 12. deficient in intelligence or mental power. 
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91. In a weak moment, I told him the truth.
92. She speaks quite fluently but she's weak on grammar.
93. He had only a weak light to see by.
94. She tired easily and had a weak heart.
95. Those two weak boys are distant relations.
96. The pound was weak against the dollar.
97. A weak trembling sound issued from his lips.
98. He knew her weak spot where Steve was concerned.
99. He was weak, cowardly and treacherous.
100. The quiz showed up Cane's weak points in physics.
101. I've always had a weak spot for chocolate.
102. She managed a weak, unconvincing smile.
103. The country is in a weak position economically.
104. He felt so weak he could hardly stand.
105. The marvelous acting compensated for the play's weak script.
106. My ankle is rather weak, so I always put a bandage on it to support it when I play tennis.
107. It was a weak heart valve that caused her death.
108. He viewed his mission in life as protecting the weak from the evil.
109. The owner said the bird may have escaped through a weak spot in the aviary.
110. He had a weak mouth which he hid beneath a moustache and beard.
111. Swimming is helpful for bones that are porous and weak.
112. Martin's weak cries for help went unheard until 6.40pm yesterday.
113. The chief editorial writer also blames weak leadership for the current crisis.
114. He looked dazed as he spoke to reporters(Sentencedict.com), managing only a weak smile.
115. In a weak moment I said she could borrow the car.
115. Sentencedict.com is a online sentence dictionary, on which you can find nice sentences for a large number of words.
116. The commission remains so weak that it will continue to avoid confrontation with govern-ments.
117. Check your house for weak spots where a thief could get in.
118. You must be weak in the head if you believe that.
119. I enjoyed the movie but I thought the ending was very weak.
120. We are willing to befriend the weak and the poor.