1. (superl.) Moist; damp; moldy; as, muggy straw.

2. (superl.) Warm, damp, and close; as, muggy air, weather.

boggy clammy close damp dampish dank dewy fenny humid marshy moist mucky oppressive rainy roric roriferous soggy steamy sticky stifling stuffy suffocating sultry swampy tacky undried wet wettish