Not mindful; unaware, oblivious; indifferent, careless, heedless. Frequently in negative constructions… With of or †for.

Unmindful.

Unaware, thoughtless, negligent, heedless, forgetful, unmindful. With of.

Inattentive, heedless, careless.

Failing to pay due regard; heedless, indifferent, careless. Also with of, †at, †for, †to.

Without heed; paying no heed or attention; careless, inattentive, regardless.

Unheedful.

Not regarding or taking heed; indifferent.

= inattentive, adj.

Not taking thought, acting without thought or reflection; unreflecting, heedless, unsuspecting… Without construction.

Not taking notice; inattentive, unperceptive.

Not perceptive; unaware.

Heedless, careless, inattentive.

Inattentive.

Of persons, their dispositions, etc.: Not properly attentive or observant; inattentive, negligent; heedless. In quot. 1653, Not having the faculty…

That does not observe or notice; unobserving.

Inadvertent.

Not careful in observation; heedless, inattentive, careless.

Inattentive, unobservant.

That does not notice.

Not giving heed; heedless, inattentive.

Not attentive; not fixing or applying the mind steadily; not heedful or observant; negligent.

Not taking care of or paying attention to something; unnoticing, unheeding. Frequently with of.

That does not note or notice.

Unaware or unconscious of. With of, to. (Now the usual sense.)