impotent, infirm, feeble, frail, nerveless, powerless, vulnerable, slight, wishy-washy, enervated, more...

strong, robust, sturdy, powerful, resilient

strong, state, brown, very, acid, deep, languid, ambitious, moderately, thin, slow

not strong,   not strong,   not powerful,   lacking strength,   very faint,   faint or feeble,   not as strong,   most likely to cave,   not very strong,   not strong enough,   not too strong