From Longman Dictionary of Contemporary Englishfaint-heartedfaint-heart‧ed /ˌfeɪnt ˈhɑːtɪd $ -ɑːr-/ adjective 1 WORK HARDnot 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
Examples from the Corpus
faint-hearted• If predators do not oblige, the pests are picked off and squashed - not a job for the faint-hearted!• None of this is for the faint-hearted.• Not a city for the lily-livered or faint-hearted.• Playing foreign markets is not for the faint-hearted.• The coastguard duties included patrolling paths at the top of high and sheer cliffs - not a job for the faint-hearted.• This is not an investment for the faint-hearted.• Neither Baron Korf nor Iakov Rostovtsev owned serfs, but the one was faint-hearted and the other unimaginative.• Not that it is a post for the faint-hearted, even today. 