yes
The antonym of steadfast is fickle, meaning changing frequently and unpredictably.
* wavering * uncertain * irresolute
An antonym for ricochet is "straight" or "direct." This contrasts with the bouncing or deflection implied by ricochet.
worn, stale, tired, old, exhausted, obsolete, passe, rotten,
The antonym of stale is fresh.
Rejuvenated
Fresh salad.
fresh
unspoiled fresh
synonym: biting, burning, caustic, harsh, irritating, pungent, sharp, stinging antonym: sweet, fresh (as in fresh air)
blank, fresh, bare words, writing
The word superannuated means old or outdated. Antonyms would be fresh, new, young, or modern.