chickenshit

Petty and contemptible thing(s).

“Don't waste your time on that chickenshit.”

A coward.

“I told him I wasn't having his insults, and he just backed right down. What a chickenshit.”

A low-ranking officer who lords over and needlessly makes life miserable for his underlings; a petty, abusive martinet.

Petty and contemptible; contemptibly unimportant. (Compare bullshit.)

Cowardly.

“How chickenshit of that girl to just stand there and do nothing.”