i-adjective
uncool; lame; tacky; unfashionable
Casual slang for something or someone that is unfashionable, tasteless, or embarrassing. Can describe appearance, behavior, or style.
その服、ちょっとダサくない?
Isn't that outfit a bit uncool?
彼のダンスはダサいけど、面白い。
His dancing is lame, but it's funny.