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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121. The opposition now seems too weak to stage any serious protests against the government.
122. For the President, the calculations are equally difficult. If the peacekeeping operation goes wrong he risks appearing weak.
123. The child had a weak constitution and was always ill.
124. His smile made her go weak at the knees .
125. Until the beating, Cantanco's eyesight had been weak, but adequate.
126. Dave caught me at a weak moment and I lent him ￡10.
127. The survey claims loan companies prey on weak families already in debt.
128. The excellent acting wasn't enough to redeem a weak plot.
129. The thought of kissing him made me go weak at the knees.
130. The president says the measure is soft and weak on criminals.
131. She went straight for the one weak link in the chain of his argument.
132. Her legs were so weak that she fell down on her knees.
133. He homed in on the one weak link in the argument.
134. In a weak moment, I agreed to pay for her holiday.
135. He fell down on the road and was too weak to get up.
136. The gardener pinched out the weak shoot on a plant.
137. He argued that it was the role of governments to protect the weak.
138. Just the sight of him made her go all weak.
139. Central Asia is a fragile region, politically weak but strategically important.
140. The play is tolerably amusing, but it is let down by the actors' weak performances.
141. My mother was very weak; she could not stand up to this cold weather.
142. The weak dollar means American goods are relative bargains for foreigners.
143. The country has suffered years of misrule by a weak and corrupt government.
144. The changes come after mounting criticism that the government is weak and indecisive.
145. The minute division of labour in the production process,and increasing interdependency in trade and economy is evident in the financial crisis afflicting us at the end of this century. Economic activity is no longer purely a matter of production, trade and barter. It is a means to satisfy human desires of every kind. Within it,(www.Sentencedict.com) there is an element of unequal relationship between the strong and the weak.
146. To his surprise he didn't feel too weak. Light-headed certainly, and with a sense of unreality, but able to walk.
147. Diarrhoea can make you feel weak, as well as putting you off your food.
148. I was so weak that even standing up was an effort.
149. They wanted a weak president and a strong one-chamber parliament able to push through radical reforms.
150. The shock made me go all weak at the knees.