powerless (adj.)

• anemic
• asthenic
• bloodless
• chicken
• cowardly
• crippled
• debilitated
• decrepit
• disabled
• drooping
• droopy
• dull
• effete
• etiolated
• faint
• feeble
• flabby
• flaccid
• floppy
• forceless
• gone
• gutless
• helpless
• imbecile
• impotent
• inactive
• incapable
• incapacitated
• incompetent
• ineffective
• ineffectual
• inefficacious
• inert
• infirm
• languid
• languorous
• lightweight
• limber
• limp
• listless
• nerveless
• no-account
• passive
• rubbery
• sapless
• slack
• soft
• spineless
• supine
• unable
• unfit
• unhardened
• unnerved
• unstrung
• weak
• weakly