1. adj. Lacking in force (usually strength) or ability.
The child was too weak to move the boulder.
They easily guessed his weak computer password.
2. adj. Unable to sustain a great weight, pressure, or strain.
a weak timber; a weak rope
3. adj. Unable to withstand temptation, urgency, persuasion, etc.; easily impressed, moved, or overcome; accessible; vulnerable.
weak resolutions; weak virtue
4. adj. Dilute, lacking in taste or potency.
We were served stale bread and weak tea.
5. adj. (grammar) Displaying a particular kind of inflection, including:
6. adj. (Germanic languages, of verbs) Regular in inflection, lacking vowel changes and having a past tense with -d- or -t-.
7. adj. (Germanic languages, of nouns) Showing less distinct grammatical endings.
8. adj. (Germanic languages, of adjectives) Definite in meaning, often used with a definite article or similar word.
9. adj. (chemistry) That does not ionize completely into anions and cations in a solution.
a weak acid; a weak base
10. adj. (physics) One of the four fundamental forces associated with nuclear decay.
11. adj. (slang) Bad or uncool.
This place is weak.
12. adj. (mathematics, logic) Having a narrow range of logical consequences; narrowly applicable. (Often contrasted with a strong statement which implies it.)
13. adj. Resulting from, or indicating, lack of judgment, discernment, or firmness; unwise; hence, foolish.
14. adj. Not having power to convince; not supported by force of reason or truth; unsustained.
The prosecution advanced a weak case.
15. adj. Lacking in vigour or expression.
a weak sentence; a weak style
16. adj. Not prevalent or effective, or not felt to be prevalent; not potent; feeble.
17. adj. (stock exchange) Tending towards lower prices.