weak, feeble, frail, fragile, infirm, decrepit mean not strong enough to endure strain, pressure, or strenuous effort. weak applies to deficiency or inferiority in strength or power of any sort.

Define weak. weak synonyms, weak pronunciation, weak translation, English dictionary definition of weak. not strong; feeble; lacking firmness or force of will: The illness had made her weak.

WEAK definition: 1. not physically strong: 2. not strong in character, so that you are not able to make decisions…. Learn more.

If you describe someone as weak, you mean that they are not very confident or determined, so that they are often frightened or worried, or easily influenced by other people.

Weak, decrepit, feeble, weakly imply a lack of strength or of good health. Weak means not physically strong, because of extreme youth, old age, illness, etc.: weak after an attack of fever.

Jan 20, 2026 · When we say that an acid is weak, we refer only to its degree of dissociation, not to its degree of corrosiveness; but it is true that those two traits often correlate, though.

Resulting from or indicating lack of judgment, discernment, or firmness; arising from want of moral courage, of self-denial, or of determination; injudicious: as, a weak compliance; a weak surrender.

WEAK definition: not strong; liable to yield, break, or collapse under pressure or strain; fragile; frail. See examples of weak used in a sentence.

Words related to weakness are not direct synonyms, but are associated with the word weakness. Browse related words to learn more about word associations. From Roget's 21st Century Thesaurus, …

These adjectives mean lacking or showing a lack of strength.