Declan

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The Japanese word

退屈

is pronounced
taikutsu | たいくつ
means
tedium, boredom
Examples:
私は退屈でかなわない。
watashi wa taikutsu de kanawa nai.
The boredom is unbearable.
長い旅行の退屈をミステリーを読んで紛らした。
nagai ryokō no taikutsu o misuterī o yon de magirashi ta.
I distracted myself from the boredom of my long journey by reading mysteries.
Examples sourced from tatoeba.org