adjective characteristic of an
amateur, especially in having the faults or deficiencies of an
amateur; inept:
Though an enthusiastic violinist, he gave an amateurish performance.
Related forms am·a·teur·ish·ly, adverb
am·a·teur·ish·ness, noun
pseu·do·am·a·teur·ish, adjective
pseu·do·am·a·teur·ish·ly, adverb
qua·si-am·a·teur·ish, adjective
qua·si-am·a·teur·ish·ly, adverb