bumbler

Definition of Bumbler in English :

someone who makes mistakes because of incompetence

WordNet Lexical Database for English. Princeton University. 2010.

Bumbler

verb

1.

to speak or do in a clumsy, muddled, or inefficient way

he bumbled his way through his speech

2. (intransitive)

to proceed unsteadily; stumble

noun

3.

a blunder or botch

verb

(intransitive)

to make a humming sound

verb intransitiveWord forms: ˈbumbled or ˈbumbling

1.

to blunder

2.

to stumble

verb transitive

3.

to bungle or botch

v. bum·bled, bum·bling, bum·bles

v.intr.

1. To speak in a faltering manner.

2. To move, act, or proceed clumsily. See Synonyms at blunder.

3. To make a buzzing sound.

v.tr.

1. To say (something) in a faltering manner.

2. To bungle; botch: bumble one's lines in a play.