thumby in English dictionary thumby Meanings and definitions of "thumby" (slang) A little thumb; diminutive term for thumb dirtied by thumb marks adjective Clumsy, awkward, maladroit, not dextrous, all thumbs adjective Dirtied by thumb marks noun (slang) A little thumb; diminutive term for thumb more Grammar and declension of thumby thumby ( plural thumbies) thumby ( comparative more thumby, superlative most thumby) thumby (comparative thumbier, superlative thumbiest) thumby (plural thumbies) more Thumby Sample sentences with "thumby" Declension Stem Try again Available translations Cornish Dutch Esperanto German Romanian Russian Turkish Volapük Authors