unalterable (adj.) unalloyed (adj.) unalienable (adj.) unaided (adj.) unafraid (adj.) unaffected (adj.) unadvertised (adj.) unadulterated (adj.) unadorned (adj.) unacquainted (adj.) unacknowledged (adj.) unaccustomed (adj.) unaccredited (adj.) unaccountable (adj.) unaccomplished (adj.) unaccompanied (adj.) unacceptable (adj.) unaccented (adj.) unabridged (adj.) unable (adj.)