WordReference Random House Learner's Dictionary of American English © 2026
un•nat•u•ral /ʌnˈnætʃərəl, -ˈnætʃrəl/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2026- contrary to the laws or course of nature;
different from or opposite from the normal or expected character or nature of a person, animal, or plant. - not genuine or natural;
artificial:a forced, unnatural smile.
un•nat•u•ral
(un nach′ər əl, -nach′rəl),USA pronunciation adj.
un•nat′u•ral•ly, adv.
un•nat′u•ral•ness, n.
- contrary to the laws or course of nature.
- at variance with the character or nature of a person, animal, or plant.
- at variance with what is normal or to be expected:the unnatural atmosphere of the place.
- lacking human qualities or sympathies;
monstrous;
inhuman:an obsessive and unnatural hatred. - not genuine or spontaneous;
artificial or contrived:a stiff, unnatural manner. - [Obs.]lacking a valid or natural claim;
illegitimate.
- 1375–1425; late Middle English; see un-1, natural
un•nat′u•ral•ness, n.
- 3. irregular, aberrant. 4. heartless, brutal.
'unnaturally' also found in these entries (note: many are not synonyms or translations):