unbusinesslike

/ʌnˈbɪznɪsˌlaɪk/
adjective
  1. Not efficient, professional, or practical in the way business is conducted.
    • The casual dress code felt unbusinesslike for a corporate headquarters.
    • It seemed unbusinesslike to hold meetings without an agenda.
    • His unbusinesslike approach to deadlines caused the project to fail.
  2. Not characteristic of or suitable for a business setting; informal or disorganized.
    • Her unbusinesslike manner made clients question her reliability.
    • The office's unbusinesslike atmosphere hurt their professional reputation.
    • They considered the handwritten receipts too unbusinesslike for modern accounting.