Declan

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The Japanese word

不意

is pronounced
hui | ふい
means
sudden, abrupt, unexpected, unforeseen
Examples:
不意に電気がすべて消えた。
fui ni denki ga subete kie ta.
All of a sudden, all the lights went out.
その車は不意に方向を変えた。
sono kuruma wa fui ni hōkō o kae ta.
The car made an abrupt turn.
私たちのところに、不意の来客があった。
watashi tachi no tokoro ni, fui no raikyaku ga atta.
We had unexpected visitors.
Examples sourced from tatoeba.org