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ぬくぬく nukunuku
Snug, toasty and going nowhere.
What does nukunuku mean?
Being wrapped up warm while the world outside is cold. It can also tease someone living a comfortable, sheltered life.
Example
布団の中でぬくぬくしていたい。
I just want to stay snuggled up in bed.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind nukunuku
Behind this word sits nukui, an older and still regional way of saying warm, the root that also gives Japanese nukumori, the warmth left behind by a body. Nukunuku is that warmth with a wall around it: under the quilt while the room is freezing, inside a kotatsu, in a coat that wins the argument with the wind.
Because it implies shelter, it can be aimed at people. Nukunuku to sodatsu means raised in comfort, never rained on, which is affectionate from a parent and pointed from a colleague. The word carries no venom, only the suggestion that somebody has been very warm for a very long time while others were outside.