gutless (adj.)

• anemic
• asthenic
• bloodless
• chicken
• cowardly
• craven
• debilitated
• drooping
• droopy
• dull
• effete
• etiolated
• faint
• feeble
• flabby
• flaccid
• floppy
• gone
• heartless
• imbecile
• impotent
• languid
• languorous
• lily-livered
• limber
• limp
• listless
• nerveless
• powerless
• pusillanimous
• rubbery
• sapless
• slack
• soft
• spineless
• spiritless
• ungallant
• unhardened
• unmanly
• unnerved
• unsoldierly
• unstrung
• weak
• weakly