Roget's Thesaurus: Entry 863 (Rashness)

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#863. Rashness. -- N. rashness &c. adj.; temerity, want of caution, imprudence, indiscretion; overconfidence, presumption, audacity.

precipitancy, precipitation; impetuosity,; levity; foolhardihood[obs], foolhardiness; heedlessness, thoughtlessness &c. (inattention) 458; carelessness &c. (neglect) 460; desperation; Quixotism, knight-errantry; fire eating.

gaming, gambling; blind bargain, leap in the dark, leap of faith, fool's paradise; too many eggs in one basket.

desperado, rashling[obs], madcap, daredevil, Hotspur, fire eater, bully, bravo, Hector, scapegrace, enfant perdu[Fr]; Don Quixote, knight- errant, Icarus; adventurer; gambler, gamester; dynamitard[obs]; boomer [obs][U. S.].

V. be rash &c. adj.; stick at nothing, play a desperate game; run into danger &c. 665; play with fire, play with edge tools.

carry too much sail, sail too near the wind, ride at single anchor, go out of one's depth.

take a leap in the dark, buy a pig in a poke.

donner tete baissee [Fr]; knock, one's bead against a wall &c. (be unskillful) 699; rush on destruction; kick against the pricks, tempt Providence, go on a forlorn hope, go on a fool's errand.

reckon one's chickens before they are hatched, count one's chickens before they are hatched, reckon without one's host; catch at straws; trust to a broken reed, lean on a broken reed.

Adj. rash, incautious, indiscreet; imprudent, improvident, temerarious; uncalculating[obs]; heedless; careless &c. (neglectful) 460; without ballast, heels over head, head over heels; giddy &c. (inattentive) 458; wanton, reckless, wild, madcap; desperate, devil-may-care.

hot-blooded, hotheaded, hotbrained[obs]; headlong, headstrong; breakneck; foolhardy; harebrained; precipitate, impulsive. overconfident, overweening; venturesome, venturous; adventurous, Quixotic, fire eating, cavalier; janty[obs], jaunty, free and easy.

off one's guard &c. (inexpectant) 508[obs].

Adv. post haste, a corps perdu[Fr], hand over head, tete baissee[Fr], headforemost[obs]; happen what may, come what may.

Phr. neck or nothing, the devil being in one; non semper temeritas est felix [Lat][Livy]; paucis temeritas est bono multis malo [Lat][Phaedrus].