Main entry: frail
Definition: physically weak
Usage: an invalid's frail body
Antonyms: robust
Definition: sturdy and strong in form, constitution, or construction
Antonyms: strong
Definition: having strength or power greater than average or expected
Antonyms: strongly
Definition: with strength or in a strong manner
Main entry: fallible, frail, imperfect, weak
Definition: wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings
Usage: I'm only a fallible human; frail humanity
Antonyms: nonhuman
Definition: not human; not belonging to or produced by or appropriate to human beings
Main entry: delicate, fragile, frail
Definition: easily broken or damaged or destroyed
Usage: a kite too delicate to fly safely; fragile porcelain plates; fragile old bones; a frail craft
Antonyms: unbreakable
Definition: impossible to break especially under ordinary usage