Firm and Fail-safe

Firm adjective - Not showing weakness or uncertainty.

Fail-safe and firm are semantically related. In some cases you can use "Fail-safe" instead an adjective "Firm".

Nearby Words: firming, firmness, firmly, firmed

Fail-safe adjective - Not likely to fail.

Firm and fail-safe are semantically related. Sometimes you can use "Firm" instead an adjective phrase "Fail-safe".