Declan

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The Japanese word

愉快

is pronounced
yukai | ゆかい
means
pleasant, happy
Examples:
空の旅ほど愉快なものはない。
sora no tabi hodo yukai na mono wa nai.
Nothing is so pleasant as traveling by air.
大変すばらしい日だったので誰もが楽しく愉快な気分だった。
taihen subarashī hi datta node dare mo ga tanoshiku yukai na kibun datta.
It was such a lovely day that everybody was feeling happy and cheerful.
眠りは死よりも愉快である。少くとも容易には違いあるまい。
nemuri wa shi yori mo yukai de aru. sukunaku tomo yōi ni wa chigai aru mai.
Sleep is more pleasant than death. At least, there's not much difference.
Examples sourced from tatoeba.org