Unimpaired (adjective)

1. Not damaged or reduced in quality or value.
2. Not limited or restricted in any way.
3. Maintaining full power, strength, or function.

Origin:

From un- + impaired, past participle of impair, to damage.

Examples:

1. The athlete completed the race with an unimpaired performance.
2. The ancient artifact was found in an unimpaired state.
3. Her unimpaired vision allowed her to see clearly in the dark.
4. The factory produced goods of unimpaired quality.
5. The painting was restored to its unimpaired original appearance.