Denshi Jisho — Online Japanese dictionary

退屈 たいくつ tedium; boredom
Common word, Na-adjective, Noun, Suru verb 
退屈凌ぎ たいくつしのぎ killing time; staving off boredom
Noun 
退屈しのぎ たいくつしのぎ killing time; staving off boredom
Noun 

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