The Collaborative International Dictionary of English v.0.48:

Gove \Gove\ (g[=o]v), n. [Also goaf, goof, goff.]
   A mow; a rick for hay. [Obs.] --Tusser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

goof \goof\ n.
   a stupid fool. [Colloq.]

   Syn: fathead, jackass, goose, cuckoo, zany.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

goof \goof\ v. i.
   to commit a faux pas or fault.

   Syn: sin, commit an offence, blunder, boob.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

goof
    n 1: a man who is a stupid incompetent fool [syn: fathead,
         goof, goofball, bozo, jackass, goose, cuckoo,
         twat, zany]
    2: a person who amuses others by ridiculous behavior [syn:
       clown, buffoon, goof, goofball, merry andrew]
    v 1: commit a faux pas or a fault or make a serious mistake; "I
         blundered during the job interview" [syn: drop the ball,
         sin, blunder, boob, goof]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "goof":
   asshole, bitch, bitch up, bloomer, blooper, blow, blunder, bobble,
   bonehead into it, bonehead play, boner, boo-boo, boob, boob stunt,
   booby, boot, bugger, bugger up, bungle, butterfingers, chump,
   clumsy, ding-a-ling, dingbat, dingdong, dolt, dolthead,
   drop a brick, drop the ball, dub, duff, duffer, dumb trick, err,
   fathead, flub, fluff, fool mistake, foozle, foozler, foul up,
   foul-up, fumble-fist, galoot, goof up, goofball, goofer, goon,
   gum up, hash up, hick, howler, jerk, jerk-off, klutz, louse up,
   louse-up, lummox, lump, lunkhead, mess up, miss, miss the mark,
   muck up, muck-up, muff, muffer, mutt, oaf, pratfall, prize sap,
   pull a boner, rube, sap, saphead, sawney, schlemiel, screamer,
   screw up, screw-up, slip, slip up, slob, stumblebum,
   stumblebunny