This is the 3991st most frequent Japanese word.
ダサい
Uncool; tacky; outdated.
The word 'ダサい' is used here to describe someone's outfit as being unstylish or not fashionable.
その服はちょっとダサいと思う。
I think that outfit is a bit uncool.
Here, 'ダサい' refers to someone's hobbies as being outdated or lacking appeal but does not impact their personal character.
彼の趣味はダサいけど、彼自身は素晴らしい人です。
His hobbies are uncool, but he himself is an amazing person.
In this sentence, 'ダサい' is used to express personal opinion about a song, suggesting it is not appealing despite its popularity.