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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31. She was very weak after haemorrhaging.
32. The paper's leading article described the government as weak.
33. She was still weak after her illness.
34. She was too weak to stand.
35. The weak old woman dragged along slowly.
36. We should not make game of the weak.
37. The wall is weak and requires lateral support.
38. This has a weak flavor.
39. Mother wants to come downstairs, but is too weak to walk; it'll take both of you to bring her down.
40. He was so weak from hunger he could hardly raise his meagre arms.
41. When your heart is getting exhausted to a certain extent,you are too weak to anger.
42. Her legs felt weak.
43. Babies are weak and vulnerable in the presence of huge shapes that they can only dimly perceive.
44. Individually we are weak[sentencedict.com], like a single twig but as a bundle we form a mighty faggot.
45. When the spasm passed, it left him weak and sweating.
46. How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerate of the weak and the strong. Because someday in life you will have been all of this.
47. I have no trouble,just a sense of security is too weak.
48. There is general recognition that the study techniques of many students are weak.
49. I praise the nurse can use weak shoulders strong enough to carry a daughter, mother, wife's burden.
50. They're a fairly good team - their only weak link is a relatively inexperienced goalkeeper.
51. People cry, not because they're weak. It's because they've been strong for too long.
52. Don't stand on that chair, it's got a weak leg.
53. In spite of his disappointment, he managed a weak smile.
54. He believes him to be a weak and unintelligent man.
55. We are here to protect and assist the weak and infirm.
55. Sentencedict.com is a sentence dictionary, on which you can find excellent sentences for a large number of words.
56. I tried not to draw attention to the weak points in my argument.
57. Your weak away in my heart, but let me for you and sad.
58. Consensus need not be weak, nor need it result in middle-of-the-road policies.
59. It's not surprising you feel weak if you haven't eaten properly for days.
60. I was too weak to move or think or speak.