Unauthorised

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Alternative spelling of unauthorized. UK, alt-of, alternative

    "A dozen similar, but smaller footwarmers were made at Doncaster, without official sanction, and placed in the coaches of a train conveying some of the directors to London. Sturrock was taken to task by the chairman for having incurred this unauthorised expenditure, but before he left the meeting, the directors had ordered 200 footwarmers for public use."

Adjective
  1. 1
    not endowed with authority wordnet
  2. 2
    without official authorization wordnet

Synonyms

All synonyms
unauthorizedunauthorizedunofficialwildcat

Example

More examples

"No unauthorised persons will be permitted inside the perimeter."

Etymology

From un- + authorised.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.