What is another word for unauthorised?

Need synonyms for unauthorised? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Not having any authority
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“This became an opportunity to attempt unauthorized aerobatics away from the eyes of an instructor.”
Adjective
Without any grounds to support it
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Adjective
Stealthy, furtive, well hidden, covert (especially movements)
mumUK
momUS
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