amateur
adjective
uk/ˈæmətər/ ustaking part in an activity because you are interested in it or enjoy it, not as a job:
an amateur investor
an amateur astronomer/actor/historian
Compare
professional adjective
amateur
noun [ C ]
uk/ˈæmətər/ usa person who takes part in an activity because they are interested in it or enjoy it, not as a job:
This conference is open to both amateurs and professionals.
disapproving
someone who does not have much skill in what they do:
I won't be giving them any more work - they're a bunch of amateurs.