Screwy

Adjective

 * 1)  Crazy; silly; ridiculous; insane; demented; unreasonable.
 *  That's a screwy idea; I am not going to fly all the way to Antarctica just to see a penguin! 
 * 1)  Tipsy; slightly drunk.

Thesaurus
abnormal, anomalous, apish, asinine, balmy, bananas, barmy, bats, batty, beany, befooled, beguiled, besotted, bonkers, boozy, brainless, buffoonish, buggy, bughouse, bugs, canned, cockeyed, cracked, crackers, crank, crankish, cranky, crazy, credulous, crotchety, cuckoo, daffy, daft, dazed, deviant, deviative, different, dippy, disguised, divergent, dizzy, doting, dotty, drunk, dumb, eccentric, erratic, exceptional, fatuitous, fatuous, fey, flaky, flipped, fond, fool, foolheaded, foolish, freaked-out, freakish, fruitcakey, fruity, fuddled, funny, futile, gaga, goofy, gulled, haywire, idiocratic, idiosyncratic, idiotic, imbecile, inane, inebriated, inept, infatuated, insane, irregular, just plain nuts, kinky, kooky, loony, loopy, lunatic, mad, maggoty, maudlin, moronic, muddled, nuts, nutty, odd, oddball, off the hinges, off the track, off the wall, peculiar, pixilated, plastered, potty, queer, quirky, round the bend, sappy, screwball, screwballs, senseless, sentimental, silly, singular, slaphappy, strange, stupid, thoughtless, twisted, unbalanced, unconventional, unnatural, unsound, wacky, wet, whimsical, witless

Etymology
1820, original meaning “tipsy, slightly drunk;” meaning “crazy, ridiculous” first recorded 1887.

Quotations

 * 1840, Hal of the West. Brilliant run with the Puckeridge hounds. The Sporting Magazine. March, 1840. Vol XX, No 119. p383
 * " I saw my hearty out of the yard, with his pink peeping out of his Macintosh, on his screwy old black horse, and I heard from my fair waiter that he had been vaunting that he would lick us all into fits."
 * 1868, Memorials of a theological college. London: Houlston & Wright. 1868. p9
 * "A tipsy man," said Spearman, "is generally noisy ; and I confess I was screwy on Wednesday."
 * 1877, Edward Peacock, English Dialect Society. A glossary of words used in the wapentakes of Manley and Corringham. London: Trubner & Co. 1877. p120
 * "Screwy [skroo'i], adj. mean ; stingy ; parsimonious. Alto, slightly intoxicated."

Related terms

 * have a screw loose
 * screwball
 * screw up