quasi-adv. Without consideration or reflection; unwarily, heedlessly. Obsolete.

Without order, irregularly; in disorder or confusion; at random, ‘anyhow’; aimlessly, heedlessly. Obsolete except as implied in other senses.

Without discrimination or discernment; indiscriminately. Obsolete.

In a regardless manner.

Heedlessly.

without regard, with neglect.

In an unmindful manner, heedlessly.

In an inadvertent manner; without due attention or thought; inattentively, heedlessly, carelessly; hence, unintentionally.

Inattentively.

In a heedless manner; carelessly, inattentively.

without due regard or care; without being observed or noticed.

inadvertently.

In an inattentive manner; without paying attention or giving due heed; negligently.

heedlessly.

With, or as with, a slap and a bang; without delay, immediately; without due consideration or regard to the consequences. Also of position…

Originally U.S. Used postpositively: without regard or consideration for something (in early use spec. expense); despite the consequences…

Blithely, heedlessly; with disregard of possible consequences or future implications.

Heedlessly, carelessly; taking no account of the consequences. Frequently used to intensify following adj. with negative connotation.