noun
Refers to a gentle, pleasant warmth, often from a person, object, or atmosphere.
彼の手にはぬくみがあった。
His hands had a gentle warmth.
春の日差しにぬくみを感じる。
I feel the warmth of the spring sunshine.
温かさ is the more common word for warmth, while ぬくみ is a softer, more literary or poetic term.
Derived from the adjective 温い (ぬくい), meaning 'warm'. The exact historical derivation is uncertain.