Mug·gy a. [Compar. Muggier superl. Muggiest.]
  1. Moist; damp; moldy; as, muggy straw.
  2. Warm, damp, and windless; uncomfortably hot and humid; sultry; as, muggy air, weather.
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  muggy
       adj : hot or warm and humid; "muggy weather"; "the steamy
             tropics"; "sticky weather" [syn: steamy, sticky]
       [also: muggiest, muggier]