half-hearted
  (a.)半心半意的
  half·heart·ed, Half-heart·ed a.
  1. Wanting in heart or spirit; ungenerous; unkind.
  2. Lacking zeal or courage; performed with less than a full effort; lukewarm; unenthusiastic; as, a half-hearted attempt; -- of actions. [wns=1]
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  halfhearted
       adj : feeling or showing little interest or enthusiasm; "a
             halfhearted effort"; "gave only lukewarm support to the
             candidate" [syn: lukewarm]