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Webster 1913 Edition

Adj.

Resembling a tub; specifically sounding dull and without resonance, like a tub; wanting elasticity or freedom of sound;

as, a

tubby

violin

tubby ‎(comparative tubbier, superlative tubbiest)

stout, rotund
Resembling a tub; sounding dull and without resonance or freedom of sound.
a tubby violin

stout, rotund

tubby ‎(plural tubbies)