Unauthorized rhymes with:
authorized, reauthorized, authorized, reauthorized, accessorized, authorized, burglarized, categorized, characterized, colorized, computerized, containerized, demilitarized, denuclearized, depressurized, familiarized, memorized, mesmerized, militarized, miniaturized, mischaracterized, motorized, pasteurized, plagiarized, polarized, polymerized, popularized, pressurized, pulverized, reauthorized, rubberized, summarized, terrorized, theorized, vaporized, winterized
Unauthorized sounds like:
unaddressed, undercoat, undercooked, undercut, underside, undersized, understate, understated, understood, understudy, underused, underweight, underweighted, undressed, uninterested