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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61. Only the most ingenuous person would believe such a weak excuse!
62. Tears clean the face of the weak but refresh the strong.
63. Because my left eye is so weak, my right eye has to work harder to compensate.
64. There are several weak spots in your argument.
65. He will be considered a weak leader.
66. She felt weak and without hope.
67. Her knees went weak at the sight of him.
68. I was always weak in the science subjects.
69. She was weak after her illness.
70. A weak constitution disposed her to frequent illness.
71. There are some weak points in her argument.
72. The dialogue is amusing but the plot is weak.
73. His strong points and weak points cancel out.
74. The animal was weak through loss of blood .
75. He was a weak king surrounded by corrupt advisers.
76. You're too weak;you'd better strengthen with rich food.
77. He had a weak bladder.
78. That bridge is too weak to carry heavy traffic.
79. He has a weak liver.
80. Her muscles had become weak through disuse.
81. That was an incredibly weak answer.
82. The case against her was very weak.
83. I like my coffee quite weak.
84. He was very old, and thence very weak.
85. His short stories tend to be weak on plot.
85. Sentencedict.com is a sentence dictionary, on which you can find excellent sentences for a large number of words.
86. He complained of feeling curiously weak and faint.
87. The mare looks quite weak.
88. The party was left weak and divided.
89. The animal was weak from loss of blood.
90. He voiced his solidarity with the weak and defenceless.