IPA: /ˌʌnɪmˈpɛəd/
KK: /ʌnɪmˈpɛrd/
Not damaged or weakened; in a good condition or state.
Her hearing was unimpaired, allowing her to enjoy the concert fully.
Unimpaired → It is formed from "un-" (meaning not) and "impaired" (from Latin "impairare", meaning to make worse or to diminish). The word "unimpaired" means not made worse or not diminished, indicating a state of being intact or whole.
Think of 'not' ('un-') making something 'worse' ('impaired') — that's why unimpaired means something that is not worse off.