1) Chief initially recklessly 2) Diving 3) Forward 4) Headlong 5) How some dive in 6) Impetuously 7) Like swan dives 8) One way to dive 9) Pitching 10) Plunging 11) Precipitately 12) Somersaulting 13) Tumbling 14) With the head foremost 15) Without forethought Found on https://www.crosswordclues.com/clue/headfirst