Definitionen
1.AdverbWith the head first or down.
2.AdverbWith an unrestrained forward motion."Figures out today show the economy plunging headlong into recession."
3.AdverbRashly; precipitately; without deliberation; in haste, hastily.
4.AdjectivePrecipitous.
5.AdjectivePlunging downwards head foremost.
6.AdjectiveRushing forward without restraint.
7.AdjectiveReckless; impetuous.
8.VerbTo precipitate.