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Orbit Gum
The phrase "thou art a lily-livered boy" is an insult implying that someone is cowardly or lacking courage. It suggests that the person is weak-willed or easily frightened, similar to the connotation of being timid or spineless.
Synonyms for "craven" include: * coward * fearful * lily-livered * gutless * unmanly * chicken
Lily-livered is an abstract noun for coward.
"Yellow-bellied" is a compound adjective used to describe a cowardly person. Others are "lily-livered" and "chicken-hearted."