faint-heart ‧ ed /ˌfeɪnt ˈhɑːtəd $ -ɑːr-/ BrE AmE adjective
1 . not trying very hard, because you do not want to do something, or you are not confident that you can succeed SYN half-hearted :
She made a rather faint-hearted attempt to stop him from leaving.
2 . something is not for the faint-hearted used humorously to say that something is difficult and needs a lot of effort