opaque

Synonyms: blurred cloudy dark darkened dim dirty dull dusky filmy foggy frosty fuliginous gloomy hazy impenetrable lusterless misty muddied murky nontranslucent nontransparent nubilous obfuscated shady smoky sooty thick turbid

Antonyms: clear lucid translucent transparent unclouded

Synonyms: abstruse amphibological arcane baffling concealed cryptic difficult enigmatic equivocal imperceptive incomprehensible nubilous obscure obtuse perplexing purblind tenebrous uncertain unclear unfathomable unintelligible vague

Antonyms: clear crystal-clear easy unambiguous understandable