Bumbled, past participle of bumble. Synonyms in the same form.
Bungle
bungled, botched, spoilt, blown, bobbled, fumbled, flubbed, fluffed, muffed, bollixed, mishandled, bodged, blundered, bollocksed
Stumble
stumbled, faltered
Stutter
stuttered, stammered
All synonyms for bumble →