THESAURUS
Muggy
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
ROGET THESAURUS
Muggy
Dimness
N
dimness, darkness, paleness, half light, demi-jour, partial shadow, partial eclipse, shadow of a shade, glimmer, gliming, nebulosity, cloud, eclipse, aurora, dusk, twilight, shades of evening, crepuscule, cockshut time, break of day, daybreak, dawn, moonlight, moonbeam, moonglade, moonshine, starlight, owl's light, candlelight, rushlight, firelight, farthing candle, dim, dull, lackluster, dingy, darkish, shorn of its beams, dark, faint, shadowed forth, glassy, cloudy, misty, blear, muggy, fuliginous, nebulous, nebular, obnubilated, overcast, crepuscular, muddy, lurid, leaden, dun, dirty, looming, pale, confused.
Opacity
N
opacity, opaqueness, film, cloud, opaque, impervious to light, adiaphanous, dim, turbid, thick, muddy, opacous, obfuscated, fuliginous, cloud, hazy, misty, foggy, vaporous, nubiferous, muggy, smoky, fumid, murky, dirty.