the.com/unassuming
So humble it forgot to mention it's quietly impressive.
means Modest and unpretentious, making no show of importance and demanding no special attention.
from From the verb assume in its older sense of claiming or taking on airs, plus un-; literally not putting on a self-important act.
Quiet flexOften hides serious competence behind plain manners.
Not shyDescribes lack of pretension, not lack of confidence.
Architecture loveHouses get this label for blending in tastefully.