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noun or participle which takes the aux. verb suru, noun (common) (futsuumeishi), adverb (fukushi), adverb taking the 'to' particle
to get irritated, to get annoyed, to be on the edge, to fret, to lose patience
word usually written using kana aloneonomatopoeic or mimetic word-
ビルは試験のことでいらいらしている。
Bill is nervous about the exam.
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