dabbler:

(plural: ‘dabblers‘ — for the right pronunciation, please click here)

a person who works on or studies something with some interest but without serious intentions, i.e. does not take it up as a profession or make a living out of it;

a person who participates in or takes up an activity without seriousness and only to show others of his/her knowledge in that particular field;

an amateur,

e.g.

Ronny’s a typical dabbler; he never takes anything seriously — he wants to be a painter, a boxer or even a writer.

Though the income it makes may be small, no business is simple or low, and there is no place for dabblers in any business!

Some times a dabbler writer suddenly becomes a professional writer when one of his/her articles is appreciated by a reasonable number of readers.

This new art gallery has a training centre which has effective courses for serious artists or even for dabblers who just want to ‘try’ the art of painting as a hobby.

For an answer that answers a question about a professional and a dabbler, and for an interesting ad about a book club, please click here.

Note: ‘Dabble’ is a verb and is used to mean ‘to dip, move (a finger, hand or feet) or splash in a liquid, usually a pool of water’, e.g. “She sat on a rock on the edge of the pond and dabbled her feet in the cool water.”; and of course, to mean ‘to take up some activity without seriousness or to play about’, e.g. “He never ran any business for at least six months; he dabbled with real estate business, restaurant business and then garment business and some other!”; and also to mean ‘to dab, daub or smear, i.e. to touch a surface with some soft and wet thing, such as some paint or thick ink’, e.g. “He looked funny with his face dabbled with paint.”
‘Dabbler’ or “dabbling duck” is a kind of duck that feeds in a particular posititon called ‘dabbling’, i.e. it tips up or tips upside-down to reach food at the bottom of the water bed.