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Synonyms for Bitty (same or very similar meaning)

WordNet sense 1 ((used informally) very small):
itsy-bitsy, itty-bitty, teensy, teensy-weensy, teeny, teeny-weeny, wee, weensy, weeny, bittie, teentsy

WordNet sense 2 (limited or below average in number or quantity or magnitude or extent):
little, small

From the ODE community, based on WordNetadd/edit