いびせいConjugationMeanings1i-adjectivescary; frighteningcolloquialColloquial adjective used in far western Honshu dialects (e.g., parts of Chūgoku region). Equivalent to standard Japanese 怖い (こわい).あの話はなし、いびせいなあ。That story is scary, isn't it?夜よ道みちを一人ひとりで歩あるくのはいびせい。Walking alone at night is scary.