Etymology
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imprudence (n.)
early 15c., "quality of rashness or heedlessness; imprudent act," from Old French imprudence (14c.) or directly from Latin imprudentia "lack of foresight, inconsiderateness, ignorance, inadvertence," abstract noun from imprudens "unaware, inconsiderate" (see imprudent).
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inconsiderateness (n.)
1590s, "imprudence," from inconsiderate + -ness. From 1858 as "want of consideration for others."
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indiscretion (n.)
mid-14c., "want of discretion, imprudence," from Old French indiscrecion "foolishness, imprudence" (12c.), from Late Latin indiscretionem (nominative indiscretio) "lack of discernment," from in- "not, opposite of" (see in- (1)) + discretionem "discernment, power to make distinctions" (see discretion). Meaning "indiscreet act" is from c. 1600.
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