Disagreeably moist, sticky, and cold to the touch: a clammy handshake.
Damp and unpleasant: clammy weather.
Uneasy; apprehensive: The ghost town gave us a clammy feeling.
[Middle English, sticky, probably from clam (from Old English, mud, clay) or from Middle Low German klam, stickiness.] clam'mi·ly adv., clam'mi·ness n.