unbusinesslike
adjective
un·busi·ness·like
ˌən-ˈbiz-nəs-ˌlīk
-nəz-
: lacking the qualities (such as polite seriousness and professionalism) considered appropriate for business or a businessperson : not businesslike
unbusinesslike behavior
an unbusinesslike person/personality
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Merriam-Webster unabridged
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