He is too chicken-hearted for that, or for anything else that requires pluck.
That's just like a girl—they're so thin-skinned and chicken-hearted.
These ten thousand were not chicken-hearted nor downhearted.
Say, you're not losing your nerve, you chicken-hearted rabbit, are you?
Out on you, you chicken-hearted swab, to sulk and fret like a babe new weaned!
Why, they turned out to be kind of chicken-hearted after all.
But others don't know you as well as I do, and there's plenty of them would think you were chicken-hearted.
"I didn't think you were soft, or chicken-hearted," he said.
That sort of thing tends to make the Anglo-Saxon chicken-hearted in dealing with them.
I always was chicken-hearted when a fellow seemed down on his luck.