44029
予期{よき}する (to expect) is a nominal verb with two negative forms: 予期せぬ and
予期しない. Why the せぬ form is more common than the more familiar しない?
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2017-03-02T19:00:06.077
44023
2017-03-02T23:14:45.897
3371
question
morphology
Why 予期せぬ is more common than 予期しない?
That's simply because It's a _fixed expression_ originated from classical
Japanese.

We have a number of such expressions. See: [Nuance and conversational use of
なきにしもあらず](https://japanese.stackexchange.com/q/42718/5010)
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2017-03-02T23:14:45.897
44029
2017-03-02T23:14:45.897
2017-04-13T12:43:44.260
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5010
44023
answer