coward
Definitions
A person who lacks the courage to do dangerous or unpleasant things.
Someone who is excessively afraid of danger or pain.
Characterized by a lack of bravery or resolution.
Examples
He was too much of a coward to admit his mistake in front of the group.
Only a coward would attack someone who cannot defend themselves.
Synonyms
craven poltroon wimp lily-livered spineless yellow faint-hearted