Sticky

adj. adhesive; covered with something adhesive; warm and humid; difficult, complex (Informal); unpleasant, painful (Informal)

Stickiness or the quality of being sticky can refer to several things:the physical phenomena of adhesion and  cohesionthe defining physico-chemical property of glueSticky (economics)Sticky (comics)see also: Sticky bit, Sticky content, Sticky keys
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Adjective
1. having the properties of glue
(synonym) gluey, glutinous, gummy, mucilaginous, pasty, viscid, viscous
(similar) adhesive
2. moist as with undried perspiration and with clothing sticking to the body; "felt sticky and chilly at the same time"
(similar) wet
3. hot or warm and humid; "muggy weather"; "the steamy tropics"; "sticky weather"
(synonym) muggy, steamy
(similar) wet
4. hard to deal with; especially causing pain or embarrassment; "awkward (or embarrassing or difficult) moments in the discussion"; "an awkward pause followed his remark"; "a sticky question"; "in the unenviable position of resorting to an act he had planned to save for the climax of the campaign"
(synonym) awkward, embarrassing, unenviable
(similar) difficult, hard

(superl.)
Having the quality of sticking to a surface; adhesive; gluey; viscous; viscid; glutinous; tenacious.
  

Synonyms and related words:
adherent, adhesive, amylaceous, awkward, bathed in sweat, bathetic, beaded with sweat, beery, boggy, bulldogged, bulldoggish, bulldoggy, bullheaded, clabbered, clammy, clingy, close, clotted, cloying, coagulated, curdled, damp, dampish, dank, delicate, dewy, diaphoretic, difficult, discomforting, doughy, drenched with sweat, embarrassing, fenny, formidable, gaumy, gelatinous, glairy, gluelike, gluey, glutenous, glutinose, glutinous, gooey, grumous, gumbo, gumbolike, gumlike, gummous, gummy, gushing, hairy, heavy, humid, in a sweat, inspissated, jelled, jellied, jellylike, knotty, laborious, marshy, maudlin, mawkish, moist, mucilaginous, mucky, muggy, mushy, namby-pamby, nostalgic, nostomanic, obstinate, operose, oppressive, oversentimental, oversentimentalized, pasty, persistent, perspiring, perspiry, rainy, romantic, ropy, roric, roriferous, rough, rugged, sappy, self-adhesive, sensitive, sentimental, sentimentalized, slabby, slimy, slithery, sloppy, slushy, soft, soggy, soppy, starchy, stickable, stifling, stodgy, strenuous, stringy, stubborn, stuffy, sudatory, sudoric, sudorific, suffocating, sultry, swampy, sweating, sweaty, sweltering, syrupy, tacky, tear-jerking, teary, tenacious, thick, thickened, ticklish, tough, tremelloid, tremellose, tricky, uncomfortable, undried, viscid, viscose, viscous, wet, wet with sweat, wettish, wilted