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adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
tedious, boring, dull, uninteresting, tiresome, monotonous
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カクテルパーティーは退屈なときもある。
Cocktail parties can be boring.
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noun or participle which takes the aux. verb suru, intransitive verb
to feel bored, to get bored (with), to get tired (of)