Synonyms of undergrown

1 Syllable
short, scrub, shrimp, wee, small, shot, mite, dwarf
2 Syllables
runty, dwarfed, dwarfish, runted, runtish, bantam, tiny, half-pint, peewee, scrubber, measly, little, kidstuff, stunted, peanut
3 Syllables
pint-sized
4 Syllables
immature, undersized
5 Syllables
diminutive