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ダサい dasai
Uncool, and a bit try-hard.
What does dasai mean?
Not ugly exactly — out of step. A dated graphic, an over-eager outfit, a caption that pushes too hard. Safe about your own things, cutting about someone else's.
Example
この靴、自分でもダサいと思ってる。
Even I think these shoes are uncool.
Vibe
Who you can say this to, and how it lands.
Be careful This one carries weight. Read the meaning and the story before you say it to anyone.
About yourself this usually passes as a joke. Aimed at someone else it is an insult.
The story behind dasai
Nobody has settled its origin. The most repeated story derives it from だ埼玉, a jab at the prefecture next door as shorthand for the unsophisticated countryside, but the timeline does not fit and many treat it as a joke invented after the fact. Other accounts point at 田舎くさい, a whiff of the provinces. Honest answer: unknown.
What is clear is when it mattered. It became a working tool of youth and fashion magazines in the 1970s and 1980s, an era that needed a fast verdict on what had aged. That charge never left. ダサい is not about ugliness but about timing, which is why it can be forgiven, even reclaimed.