unimpaired

comparative more unimpaired · superlative most unimpaired

1. Not impaired.

   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.

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

   Antonyms: impaired