The term 'not natural' can be described by the crossword solutions ERSATZ (6 letters), DYED (4 letters), EERIE (5 letters), made (4 letters), ALIEN (5 letters), STAGY (5 letters), forced (6 letters), manmade (7 letters), STILTED (7 letters), ABERRANT (8 letters), SNOBBISH (8 letters), IMITATION (9 letters), and SYNTHETIC (9 letters). These words all describe something that is not natural, or not occurring in nature. For example, ERSATZ is a substitute for something else, while DYED is a color that has been artificially added to something. EERIE is an unnatural feeling, while made is something that has been created by humans. ALIEN is something that does not belong in its environment, while STAGY is something that is overly theatrical or artificial. Forced is something that is done without consent, while manmade is something that has been created by humans. STILTED is something that is stiff or awkward, while ABERRANT is something that is deviant or abnormal. SNOBBISH is something that is arrogant or pretentious, while IMITATION is something that is a copy of something else. Finally, SYNTHETIC is something that is artificially created.