1. To weaken or destroy the strength or vitality of: "the luxury which enervates and destroys nations" (Henry DavidThoreau). See Synonyms at deplete. 2. Medicine To remove a nerve or part of a nerve.
1. Lacking in cunning, guile, or worldliness; artless. 2. Openly straightforward or frank; candid. See Synonyms at naive. 3. Obsolete Ingenious.
Etymology
Being very dull and stupid, Bob was a very ingenuous man.