cowardly
cow-ard-ly
adjective
Lacking courage; showing fear or timidity when facing danger or difficulty.
"His cowardly refusal to help was shameful."
Thesaurus
Synonyms: unmanly, craven, fainthearted, caitiff, yellow-bellied, dastardly, pusillanimous, poltroon, dastard, faint, yellow, poor-spirited
Antonyms: brave, courageous