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ガン無視 gan mushi
Ignored. Completely and on purpose.
What does gan mushi mean?
ガン is the intensifier, so this is ignoring with real commitment. Not missing your message — choosing it.
Example
手を振ったのにガン無視された。
I waved and got completely ignored.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind gan mushi
The ガン in front is an intensifier with a rough past. It is generally connected to hard staring, the vocabulary of glaring someone down that came up through delinquent speech, and it survives in ガン見, to stare openly. Attached to other verbs it simply means fully, without restraint: ガン泣き, ガン積み.
So ガン無視 is ignoring performed at full strength. Messaging changed how much it hurts. Once apps started showing that a message had been read, silence stopped being deniable, and Japanese produced 既読スルー for exactly that wound. ガン無視 is its louder cousin, used for the friend who walked past you, saw you, and kept walking.