だせい 惰性 Wanikani level 52 LinksSentence search for 惰性Sentence search for だせいKanji details for 惰 and 性Edit in JMdict Noun1. force of habitこうこう高校じだい時代からつきあっているかれし彼氏はいるものの、つきあいがだせい惰性になっているとかん感じ、ふまん不満をつのらせている。She has a boyfriend she's been going out with since high school but feels their relationship has become a matter of habit and is increasingly dissatisfied.Noun2. inertiaPhysics, Rare term, See also 慣性 Discussions Log in to talk about this word.