WordReference Random House Learner's Dictionary of American English © 2026
un•con•sti•tu•tion•al /ˌʌnkɑnstɪˈtuʃənəl, -ˈtyu-/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2026- Governmentnot constitutional;
not authorized by, or not consistent with, a constitution, esp. the U.S. Constitution.
un•con•sti•tu•tion•al
(un′kon sti to̅o̅′shə nl, -tyo̅o̅′-),USA pronunciation adj.
un′con•sti•tu′tion•al•ism, n.
un′con•sti•tu′tion•al′i•ty, n.
un′con•sti•tu′tion•al•ly, adv.
- Governmentnot constitutional;
unauthorized by or inconsistent with the constitution, as of a country.
- un-1 + constitutional 1735–45
un′con•sti•tu′tion•al′i•ty, n.
un′con•sti•tu′tion•al•ly, adv.