(adj) feeling or showing little interest or enthusiasm, Syn. half-hearted, tepid, lukewarm, Example:a halfhearted effort; gave only lukewarm support to the candidate
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. 1. Wanting in heart or spirit; ungenerous; unkind. B. Jonson. [ 1913 Webster ]
2. Lacking zeal or courage; performed with less than a full effort; lukewarm; unenthusiastic; as, a half-hearted attempt; -- of actions. [ wns=1 ] H. James. [ 1913 Webster +PJC ]