unfast

verb, adj — 2 senses

unfast

verb

Etymology From Middle English unfasten, unvesten, onfesten, equivalent to un- + fast.

1

To loose; release.

unfast

adj

Etymology From un- + fast.

1

Not fast or safe; not secure.

Derived terms
unfastness

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.