halfhearted
ˌhɑːfˈhɑːtɪd
adjective
without enthusiasm or energy.
a half-hearted attempt
unenthusiastic,lukewarm,cool,apathetic,perfunctory,cursory,superficial,desultory,feeble,faint,weak,tepid,indifferent,unconcerned,listless,lacklustre,dispassionate,uninterested,unemotional,languid,passive,Laodicean