むさいalso: むっさいむさいFreq.FrequencyTop 50,000ConjugationMeanings1i-adjectivefilthy; squalid; dirty; foulcolloquialColloquial adjective describing a person, place, or thing as grimy, unkempt, or physically repulsive. Often used for a scruffy appearance or a messy, unclean room. Related to むさくるしい, but shorter and more casual.See also: むさくるしい彼かれの部屋へやはむさくて、足あしの