1) Feebly 2) Fruitlessly 3) Futilely 4) Hopelessly 5) In vain 6) Ineffectively 7) Inefficiently 8) To no avail 9) To no purpose 10) Unproductively 11) Uselessly 12) Vainly 13) Without success Found on https://www.crosswordclues.com/clue/unsuccessfully