safety: the settled condition of being secure and unafraid
This is a noun built from the verb meaning to trust, and across the Hebrew Bible it almost always works like the adverb "safely" or "securely." It describes the real, settled state of a people or person who is genuinely protected and so can live without fear.
It clusters with the everyday verbs of ordinary life: dwelling, lying down, walking, resting. To "dwell in safety" is the picture of a settled life where homes are built, vineyards are planted, and no enemy disturbs the night. So the word names more than the absence of danger; it names the calm that follows from being kept.
In the prophets this becomes one of the great pictures of restoration. When God promises to bring his scattered people home, he promises that they will live in safety, with no one to make them afraid. The security is grounded in God's protection, which is why the same families of words that mean trust and safety overlap so closely here.