The Collaborative International Dictionary of English v.0.48:

Sticky \Stick"y\, a. [Compar. Stickier; superl. Stickiest.]
   Having the quality of sticking to a surface; adhesive; gluey;
   viscous; viscid; glutinous; tenacious.
   [1913 Webster]

         Herbs which last longest are those of strong smell, and
         with a sticky stalk.                     --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sticky
    adj 1: having the sticky properties of an adhesive [syn:
           gluey, glutinous, gummy, mucilaginous, pasty,
           sticky, viscid, viscous]
    2: moist as with undried perspiration and with clothing sticking
       to the body; "felt sticky and chilly at the same time"
    3: hot or warm and humid; "muggy weather"; "the steamy tropics";
       "sticky weather" [syn: muggy, steamy, sticky]
    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"
       [syn: awkward, embarrassing, sticky, unenviable]
    5: covered with an adhesive material

Moby Thesaurus II by Grady Ward, 1.0:

138 Moby Thesaurus words for "sticky":
   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