headlong

adv.

1. With the head leading; headfirst: The runner slid headlong into third base.
2. In an impetuous manner; rashly.
3. At breakneck speed or with uncontrolled force.

adj. (hĕd'lông', -lŏng')

1. Done with the head leading; headfirst: a headlong dive.
2. Impetuous; rash. See synonyms at impetuous.
3. Uncontrollably forceful or fast.
4. Archaic. Steep; sheer.

[From Middle English (bi) hedlong, alteration of (bi) hedling : hed, head; see head + -ling, in a specified direction; see -ling².]

adjective

Characterized by unthinking boldness and haste: brash, foolhardy, harum-scarum, hasty, hotheaded, ill-considered, impetuous, improvident, impulsive, incautious, madcap, precipitant, precipitate, rash¹, reckless, slapdash, temerarious, unconsidered. See careful/careless.

adj

Definition: dangerous, reckless
Antonyms: careful, cautious, cautiously, thoughtfully, wary

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Dansk (Danish)
adv. - hovedkuls, på hovedet, ubesindigt, voldsomt
adj. - hovedkuls

Nederlands (Dutch)
regelrecht, halsoverkop, pal, voorover, overijld

Français (French)
adv. - tête la première, à toute vitesse, (fig) tête baissée
adj. - tête la première, en avant, précipité

Deutsch (German)
adj. - überstürzt
adv. - überstürzt, kopfüber

Ελληνική (Greek)
adj. - απερίσκεπτος, βιαστικός, με το κεφάλι μπροστά, ορμητικός, ακάθεκτος
adv. - με το κεφάλι μπροστά, ορμητικά

Italiano (Italian)
a capofitto, precipitosamente

Português (Portuguese)
adj. - impetuoso
adv. - impetuosamente

Русский (Russian)
головой вперед, опрометчивый, стремительно, бешено, опрометчиво

Español (Spanish)
adv. - de cabeza, de bruces, precipitadamente
adj. - de cabeza, de bruces, precipitado

Svenska (Swedish)
adj. - plötslig, hejdlös
adv. - huvudstupa

中文（简体）(Chinese (Simplified))
头向前地, 猛然地, 头向前的, 轻率的, 匆促而用力的

中文（繁體）(Chinese (Traditional))
adv. - 頭向前地, 猛然地
adj. - 頭向前的, 輕率的, 匆促而用力的

한국어 (Korean)
adv. - 거꾸로, 무분별하게, 쏜살같이, 사납게
adj. - 거꾸로의, 쏜살같은, 무분별한, 경솔한

日本語 (Japanese)
adv. - まっさかさまに, 向こう見ずに
adj. - まっさかさまの, むこうみずな, 軽率な, 大急ぎの

العربيه (Arabic)
‏(صفه) شديد التحدر, متهور, طائش, عاطس في الماء ورأسه في المقدمه (ظرف) بوضع يكون فيه الرأس, في المقدمه, بتهور, بطيش, بغير تردد أو توان‏

עברית (Hebrew)
adv. - ‮בקלות דעת, בראש נטוי קדימה, בחיפזון‬
adj. - ‮פזיז, חפוז‬

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