1. moderately warm (Freq. 1) - he hates lukewarm coffee - tepid bath water • Syn: tepid • Similar to: warm • Derivationally related forms: tepidness (for: tepid), tepidity (for: tepid), lukewarmness 2. feeling or showing little interest or enthusiasm (Freq. 1) - a halfhearted effort - gave only lukewarm support to the candidate • Syn: halfhearted, half-hearted, tepid • Similar to: unenthusiastic • Derivationally related forms: lukewarmness, tepidness (for: tepid)