Как по Английски будет неклассический

adjective

Not based on styles and methods developed over a long period of time and not considered to be of lasting value

Примеры использования:

She has just recorded an album of non-classical music., a nonclassical system of logic

adjective

Not classical; not belonging to or characteristic of a traditional or long-established form or style; specifically not belonging to or characteristic of greek or roman antiquity.