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Webster 1913 Edition

adv.

With rash or foolish haste; in headlong manner.

Milton.

adv.

With great haste; with rash unadvised haste; with tumultuous hurry.

precipitantly ‎(comparative more precipitantly, superlative most precipitantly)

With rash or foolish haste; in a headlong manner.
(Can we find and add a quotation of Milton to this entry?)