noun, noun which may take the genitive case particle 'no'
excitable disposition; hot-headedness
Refers to a personality trait of being easily excited or quick to react emotionally. Often used in medical or psychological contexts, but can appear in everyday descriptions of temperament.
彼は熱性の気質で、すぐに怒り出す。
He has an excitable disposition and gets angry quickly.
熱性の性格は時に周囲を困らせる。
A hot-headed personality sometimes troubles those around them.