unimpaired

un- +‎ impaired

unimpaired (comparative more unimpaired, superlative most unimpaired)

1. Not impaired.

   Antonym: impaired

   • 1943 March and April, "Mercury", “U.S.A. Express Train Services in 1942”, in Railway Magazine, page 67:

     While the United States remained a non-belligerent speeds continued unimpaired, despite the increasingly dense occupation of main-line tracks, but the entry of the U.S.A. into the war in December, 1941, made its effect felt almost immediately.

• unimpairedly

• “unimpaired”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.