Bad Taste
noun, な adjective
Remember how 趣味 means "hobby"? Well, if you have bad hobbies, it probably means you have bad taste.
悪趣味 is often used to describe something that lacks sophistication or sensitivity, like tacky shoes and offensive jokes, as well as someone with that kind of taste.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
母は、父が悪趣味な人形を集めることを禁止しました。
My mom forbade my dad from collecting tasteless dolls.