Как по Английски будет дилетантский

noun

A person who engages in a pursuit, especially a sport, on an unpaid rather than a professional basis.

Примеры использования:

It takes five years for a top amateur to become a real tour de france rider

adjective

Engaging or engaged in without payment; non-professional.

Примеры использования:

Amateur athletics

noun

A person who cultivates an area of interest, such as the arts, without real commitment or knowledge.

Примеры использования:

A wealthy literary dilettante

adjective

Done in an unskilful or inept way.

Примеры использования:

Her amateurish interviewing technique