Colloquial term meaning uncool, unstylish, or tacky—used for clothing, behavior, design, etc.
そのジャケット、ちょっとダサいよ。別のものを探そう。
That jacket looks kind of lame. Let's look for something else.
古い流行を無理に着るとダサく見えることがある。
Forcing old fashions can sometimes look tacky.
あのギャグは最近ダサいって言われて笑えなかった。
That joke was called uncool recently, so people didn't laugh.
彼の髪型、正直言ってダサいと思う。
To be honest, I think his hairstyle is unfashionable.