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Definition of rashness : The quality or state of being rash.

Synonyms:

precipitancy, hardihood, presumption, careful, mindlessness, venturesomeness, inanity, vacuity, hurriedness, inadvertency, inadvertence, precipitation, precipitateness, pointlessness, rush, temerity, precipitance, temerariousness, inattentiveness, over-confidence, senselessness, unmindfulness

hot-temperedness, volatility, recklessness, nervousness, storminess, emotionality, ardency, passion, excitableness, brittleness, quick-temperedness, crankiness, explosiveness, combustibility, short-temperedness, tempestuousness, touchiness, edginess, sensitivity, irritability, fragility

brashness, injudiciousness, daringness, impetuousness, desperation, foolhardiness, thoughtlessness, imprudence, hotheadedness, incautiousness, audacity, brazenness, carelessness

inattention, indifference, heedlessness, haste, indiscretion, nonchalance, negligence

instantaneous, improvisation, reflexiveness, spontaneousness, hastiness, impulsiveness, extemporaneousness, abruptness

Usage examples:

• Some believed that his rider had repented of his rashness, and was about to deliver himself up to the guard, from whom he had escaped. - "The White Gauntlet", Mayne Reid.
• Owen had remembered continually what his friend had frequently overlooked, that there was yet a possibility of his sister being Manston's wife, and the recollection taught him to avoid any rashness in his proceedings which might lead to bitterness hereafter. - "Desperate Remedies", Thomas Hardy.
• Every one drew back at the thoughts of it, pronouncing it the height of rashness. - "The Life and Voyages of Christopher Columbus (Vol. II)", Washington Irving.