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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1. The spirit is willing but the flesh is weak. 
2. Every man has his weak side.
3. Everybody has some weak spot.
4. Weak men wait for opportunity, but the strong men make it.
5. Circumstances are the rulers of the weak, instruments of the wise.
6. Circumstances are therulers of the weak, instrument of the wise.
7. To be angry with a weak man is a proof that you are not very strong yourself.
8. John is good at French but weak at history.
9. A weak dyke bursts easily before a flood.
10. The prisoner's defence was rather weak.
11. She has an unerring instinct for people's weak spots.
12. Skiing is inadvisable if you have a weak heart.
13. She is a girl of weak apprehension.
14. The child's pulse was strong/weak.
15. He was criticised as a weak and indecisive leader.
16. He was a weak little mouse of a man.
17. The gorgeous words,weak language,actually cannot replace what.
18. She is still weak after her illness.
19. Every man hath his weak side.
20. 'Mr.Harmsworth,' I said in a weak voice.
21. "Weak"can be collocated with "tea", but "feeble" can not.
22. The strong usually dominate over the weak.
23. He taunted me for being weak.
24. She spoke in a weak voice.
25. The illness left her feeling weak .
26. The dance left her feeling breathless and weak.
27. Feelings of time always forward,(sentencedict.com/weak.html)never weak retention eyes.
28. She suffered from a weak heart.
29. She was born with a weak heart.
30. He cannot run because he has a weak heart.