oaf

Concise Oxford English Dictionary © 2008 Oxford University Press:
oaf/əʊf/

▶noun a stupid, boorish, or clumsy man.

– derivatives
oafish adjective,
oafishly adverb,
oafishness noun.

– origin C17 (orig. in the sense ‘elf's child’, later ‘idiot child’): var. of obs. auf, from ON álfr ‘elf’.