Headlong
Headlong adjective - Acting or done with excessive or careless speed.
Usage example: terrified forest creatures in a headlong retreat from the rapidly spreading fire
Sudden
Sudden adjective - Not expected.
Headlong is a synonym for sudden in property topic. You can use "Headlong" instead an adjective "Sudden", if it concerns topics such as unexpected.
Nearby Words: suddenly, suddenness
Mutual synonyms
Both words in one sentence
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With a bit of egging on by the master manipulator, Sasuke dives headlong off the slope; even his teammates who had suffered under Orochimaru were stunned by his sudden swerve into open murder.
Source: Protagonist Journey to Villain - Then she walks headlong into his Batman Gambit when it turns out he expected her sudden but inevitable betrayal, and Inara beat Saffron to the drop point.
Source: Good Is Not Dumb -
Then she walks headlong into his Xanatos Gambit when it turns out he expected her sudden but inevitable betrayal, and Inara beats her to the drop point.
Source: Series / Firefly
Cite this Source
Sudden and Headlong. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/headlong/sudden
Headlong & Sudden. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/headlong/sudden>.
Sudden or Headlong. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/headlong/sudden.
Google Ngram Viewer shows how "headlong" and "sudden" have occurred on timeline