Collins English-English Dictionary

weak [wiːk]

1. 1. adj lacking in physical or mental strength or force; frail or feeble

2. 2. adj liable to yield, break, or give way

   a weak link in a chain

3. 3. adj lacking in resolution or firmness of character

4. 4. adj lacking strength, power, or intensity

   a weak voice

5. 5. adj lacking strength in a particular part

   a team weak in defence

6. 6. adj not functioning as well as normal

   weak eyes

7. 7. adj easily upset

   a weak stomach

8. 8. adj lacking in conviction, persuasiveness, etc

   a weak argument

9. 9. adj lacking in political or strategic strength

   a weak state

10. 10. adj lacking the usual, full, or desirable strength of flavour

    weak tea

11. 11. adj [grammar] denoting or belonging to a class of verbs, in certain languages including the Germanic languages, whose conjugation relies on inflectional endings rather than internal vowel gradation, as look, looks, looking, looked

12. 12. adj belonging to any part-of-speech class, in any of various languages, whose inflections follow the more regular of two possible patterns - Compare strong

13. 13. adj (of a syllable) not accented or stressed

14. 14. adj (of a fuel-air mixture) containing a relatively low proportion of fuel - Compare rich

15. 15. adj [photog] having low density or contrast; thin

16. 16. adj (of an industry, market, currency, securities, etc) falling in price or characterized by falling prices

17. 17. adj [Etymology] Old English wac soft, miserable; related to Old Saxon wek, Old High German weih, Old Norse veikr