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Webster 1913 Edition

adv.

In a improvident manner.

“Improvidently rash.”

Drayton.

adv.

Without foresight or forecast; without care to provide against future wants.

improvidently ‎(comparative more improvidently, superlative most improvidently)

improvidently in The Century Dictionary, The Century Co., New York, 1911
improvidently in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913