Rash
Rash adjective - Acting or done with excessive or careless speed.
Usage example: that was too rash a move, for now I've lost my bishop and probably the whole chess game
Spontaneous and rash are semantically related. In some cases you can use "Spontaneous" instead an adjective "Rash".
Spontaneous
Spontaneous adjective - Done instantly and without conscious thought or decision.
Usage example: hugging a crying child is simply a spontaneous reaction
Rash and spontaneous are semantically related. Sometimes you can use "Rash" instead an adjective "Spontaneous".
Nearby Words: spontaneity, spontaneously
Mutual synonyms
Related pairs
Both words in one sentence
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Kai is rash and impulsive like fire, Jay is...erratic and spontaneous like lightning (in contrast to the usual for this trope) and they often act as foils.
Source: Lightning/Fire Juxtaposition -
Kai is rash and impulsive like fire, Jay is... erratic and spontaneous like lightning (in contrast to the usual for this trope).
Source: Western Animation / Ninjago -
Not only is the veil already drawing massive crowds, but it's dubious, at best, that most witnesses would regard a rash of spontaneous combustions as a sign of God's love.
Cite this Source
Spontaneous and Rash. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/rash/spontaneous
Rash & Spontaneous. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/rash/spontaneous>.
Spontaneous or Rash. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/rash/spontaneous.
Google Ngram Viewer shows how "rash" and "spontaneous" have occurred on timeline