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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151. He picked himself up and walked on with weak knees.
152. You have been conditioned to believe that it is weak to be scared.
153. The play is well acted but the plot is weak.
154. He behaved badly with impunity as he knew the teacher was weak.
155. She can still come downstairs with assistance but she's very weak.
156. Rudolph, the Adonis of the silent films, had one great quality — to make women feel weak at the knees.
157. Any evidence that exists to support the hypothesis is fairly weak.
158. I bet she led him on-but how could he be so weak?
159. With such a weak heart she was lucky to come through .
160. She's washing her hair? That sounds like a weak excuse !
161. Check your house for weak spots where a thief could enter.
162. Tom's sister says he is weak in the upper storey.
163. You must be weak in the head if you think I'll agree to that.
164. With such a weak heart she was lucky to come through the operation.
165. The monograph is conceptually confused, unclear in its structure and weak in its methodology.
166. Her school report shows that she is weak at/in arithmetic and biology.
167. The lad gives his spare time freely to help the weak and sick old people.
168. She immediately zeroed in on the weak point in his argument.
169. The molecules in regular liquids are held together by relatively weak bonds.
170. The supports were too weak for the weight of the load.
171. His sudden smile made her go weak at the knees.
172. The council was too weak to do anything about it.
173. She was so weak and exhausted that she had to lie back in the easy chair.
174. To be weak is miserable,Doing or suffering. John Milton 
175. You gain power by pretending to be weak.http://Sentencedict.com Chuck Palahniuk
176. Imagination is weak without learning, knowledge and positive thinking. Dr T.P.Chia
177. We pretend to be strong because we are weak. Paulo Coelho
178. A sneer is the weapon of the weak. James Russell Lowell
179. Strong leaders cannot tolerate weak leaders above them. Tom Krause
180. Geography was my weak subject.