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地味に jimi ni
Low-key, but it adds up.
What does jimi ni mean?
地味 means plain, so this flags something unflashy that turns out to matter: a small task that eats an hour, a quiet compliment that made your week.
Example
この作業、地味に時間かかる。
This task low-key takes ages.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind jimi ni
地味 is the plain half of an old pair. Its opposite, 派手, means flashy and loud, and between them they have sorted Japanese taste in clothes and behaviour for centuries. Plain is usually the respectable side of that line.
As an adverb, though, 地味に does something sly. It marks a gap between how small a thing looks and how much it actually does: an errand that quietly eats an hour, an unglamorous injury that hurts for weeks, an offhand compliment that carries you through the month. The word is close to the English low-key, and the flatness is a setup. What follows is always more than the framing promised.