Hairy

a.	1.	Bearing or covered with hair; made of or resembling hair; rough with hair; hirsute. His mantle hairy, and his bonnet sedge. - Milton.
	2.	Very complicated, difficult, or involved; as, a hairy problem; a hairy equation.
	3.	Dangerous or frightening; as, a hairy encounter with a mugger.

Adj.	1.	hairy - having or covered with hair; "Jacob was a hairy man"; "a hairy caterpillar" Synonyms: hirsute Antonyms: hairless - having no hair or fur; "a Mexican Hairless is about the size of a fox terrier and hairless except for a tufts on the head and tail"
	2.	hairy - hazardous and frightening; "hairy moments in the mountains"

1.		hairy - Annoyingly complicated. "DWIM is incredibly hairy."
2.		hairy - Incomprehensible. "DWIM is incredibly hairy."
3.		hairy - Of people, high-powered, authoritative, rare, expert, and/or incomprehensible. Hard to explain except in context: "He knows this hairy lawyer who says there's nothing to worry about." See also hirsute. The adjective "long-haired" is well-attested to have been in slang use among scientists and engineers during the early 1950s; it was equivalent to modern "hairy" and was very likely ancestral to the hackish use. In fact the noun "long-hair" was at the time used to describe a hairy person. Both senses probably passed out of use when long hair was adopted as a signature trait by the 1960s counterculture, leaving hackish "hairy" as a sort of stunted mutant relic.
4.	(topology)	hairy - hairy ball.

Herculean, abstruse, arduous, asperous, barbellate, barfy, bewhiskered, bristled, bristling, bristly, brutal, bum, bushy, capillary, chancy, cheesy, cirrose, cirrous, comate, complex, complicated, confused, confusing, craggy, crappy, creepy, critical, crummy, dangerous, delicate, demanding, difficile, difficult, dirty, downy, exacting, fibered, fibroid, fibrous, flagelliform, fleecy, flocculent, flossy, fluffy, formidable, frightening, fringy, funicular, furry, fuzzy, glochidiate, godawful, goshawful, gossamery, grim, hairlike, hard, hard-earned, hard-fought, harsh, hazardous, hispid, icky, intricate, jagged, jawbreaking, jeopardous, knotted, knotty, laborious, lanate, ligamental, matted, mean, nappy, nerve-racking, no picnic, not easy, operose, perilous, pilose, precarious, problematic, pubescent, punk, putrid, rigorous, risky, ropy, rough, rugged, scabrous, scary, scraggy, set with thorns, setaceous, setose, setous, severe, shagged, shitty, silky, spiny, steep, stinking, stinky, strenuous, strigal, strigate, strigose, stringy, stubbled, stubbly, studded, taeniate, taeniform, tangled, thorny, threadlike, thready, ticklish, toilsome, tough, treacherous, trichoid, tricky, tufted, uncertain, uneven, unhealthy, unshaven, unshorn, unsmooth, unsound, uphill, vomity, whiskered, wicked, wiry, woolly, worrying, yecchy