half-hearted
adjective
UK/ˌhɑːfˈhɑː.tɪd/
US/ˌhæfˈhɑːr.t̬ɪd/
Definitions of half-hearted adjective
lacking enthusiasm or commitment; showing a lack of interest or effort.
He made a half-hearted offer to resign.
She gave a half-hearted smile, not really feeling happy.
Their support for the project was half-hearted.