in a way that allows for continual use of a natural resource without depleting it or causing environmental damage: sustainably grown coffee.
in a way that can be sustained in the long term: a sustainably profitable business.

Origin of sustainably

First recorded in 1840–45; sustainable + -ly Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sustainably

Contemporary Examples of sustainably