In an amateurish or nonprofessional manner.(adverb)
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Use "amateurishly" in a sentence
"The voice was rough, unfriendly, and curiously sexless—mainly due to its being heavily, if amateurishly, disguised."
"To the extent that they adopted any of its recommendations, orchestras did so halfheartedly, amateurishly and without real faith in the underlying premise: that audiences craved a new kind of concert, updated for the 20th century."
"What in the original incarnation was shockingly cheeky, in its graphic and profane depiction of teens indulging in sex-and-drug debauchery, has been neutered and tamed in a remake that is unconvincing, amateurishly produced and very poorly acted."