Fast and Unsecured

Fast

Fast adjective - Firmly positioned in place and difficult to dislodge.
Usage example: the rusty, old screws are so fast in the fitting that there's no hope of getting them out

Unsecured is an antonym for fast.

Nearby Words: fasted, fasting

Unsecured

Unsecured adjective - Not tightly fastened, tied, or stretched.
Usage example: an unsecured luggage rack on top of the car that was a hazard to other vehicles on the road

Fast is an antonym for unsecured.
Cite this Source
Unsecured and Fast. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fast/unsecured
Fast & Unsecured. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fast/unsecured>.
Unsecured or Fast. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fast/unsecured.
Google Ngram Viewer shows how "fast" and "unsecured" have occurred on timeline