Etymology
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oaf (n.)

1620s, auf, oph (modern form from 1630s; oafish is from 1610s), "a changeling; a foolish or otherwise defective child left by the fairies in place of another carried off," from a Scandinavian source such as Norwegian alfr "silly person," in Old Norse "elf" (see elf). Hence, "a misbegotten, deformed idiot, a simpleton" (17c.). Until recently, some dictionaries still gave the plural as oaves.

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Definitions of oaf

oaf (n.)
an awkward stupid person;
Synonyms: lout / clod / stumblebum / goon / lubber / lummox / lump / gawk
From wordnet.princeton.edu