1) Impolitely 2) In an improper way 3) In an unseemly fashion 4) Inadequately 5) Inappropriately 6) Incorrectly 7) Indecently 8) Indelicately 9) Not according to Hoyle 10) Unbecomingly 11) Unsuitably Found on https://www.crosswordclues.com/clue/improperly