na-adjective, noun which may take the genitive case particle 'no', noun
having no hobbies; lacking interests
Describes a person who has no hobbies or personal interests, often with a slightly negative connotation of being dull or uninteresting.
彼は無趣味で、休みの日はいつも家で寝ている。
He has no hobbies and always sleeps at home on his days off.
無趣味な人は会話が続かないことが多い。
People with no interests often can't keep a conversation going.
na-adjective, noun which may take the genitive case particle 'no', noun
tasteless; dull; uninteresting
Used for things that lack refinement, aesthetic appeal, or excitement; can describe a person's character, a work of art, or a lifestyle. 'Vulgar' in the English gloss refers to lack of taste, not obscenity.
あの部屋の飾り付けは無趣味だね。
That room's decoration is tasteless, isn't it?
無趣味な生活を送っていると、心が
Living a dull, uninteresting life makes your heart poor.
退屈 means 'boring' or 'tedious' and focuses on the feeling of boredom; 無趣味 describes a lack of interests or refinement.
Compound of 無 (mu, 'without') and 趣味 (shumi, 'hobby; taste').