puny

Synonyms: diminutive feeble fragile frail half-pint inconsequential inferior infirm little measly minor niggling nothing paltry peanut peewee petty picayune piddling pint-sized runt shrimp small-fry small time stunted tiny trifling trivial two-bit unconsequential underfed undersized undeveloped unsound unsubstantial weak weakly wee worthless zero zilch

Antonyms: big giant huge large