Use the adjective half-hearted to describe someone whose heart is not really in what they are doing.

If you're a half-hearted member of your school marching band, you're not very excited about playing your tuba during halftime at football games. You might show up for awkward family dinners with your strange cousins, but you don't look forward to it and you can't wait until it's over. You're a half-hearted participant, and when your weird relatives leave, you probably give a half-hearted wave goodbye. The word can also be spelled "halfhearted."

Definitions of half-hearted
  1. adjective
    feeling or showing little interest or enthusiasm
    synonyms: halfhearted, lukewarm, tepid
    not enthusiastic; lacking excitement or ardor
Word Family

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