Unvigorous

Part of speech: adjective

Definitions

1. Lacking physical strength, energy, or forceful activity, so that a person or thing seems weak and slow
2. Describing someone or something that shows little liveliness, robustness, or active power in its movement or effort
3. Characterizing a state of weakness or languor, where vitality and forcefulness are noticeably absent

Etymology: "Unvigorous" is a plain English compound: the prefix "un-", meaning "not", attached to "vigorous." The base word comes from the Latin "vigorosus," formed from "vigor," meaning liveliness or strength, and it reached English as an adjective describing energy and force. Because "un-" is one of the most productive negating prefixes in English, speakers have long been able to create negated forms of nearly any adjective, and "unvigorous" follows that pattern directly.

Synonyms: feeble, weak, languid

Antonyms: vigorous, energetic