godan verb (-ku), intransitive verb
become ingrained; become embedded; permeate
Used for stains, smells, or abstract things that become deeply fixed and hard to remove. Often implies a lasting, negative, or stubborn quality.
カレーの匂いがカーテンに染み付いてしまった。
The smell of curry has permeated the curtains.
悪い癖が染み付い
A bad habit has become ingrained.
godan verb (-ku), intransitive verb
become second nature; become a deeply ingrained habit
Specifically for habits, skills, or behaviors that have become automatic through repetition. Often used with 体に (in the body).
毎朝のジョギングが体に染み付いている。
My morning jog has become second nature.
礼儀作法は子供の頃に染み付くものだ。
Good manners become ingrained in childhood.