Synonyms of the word

heedless

• adj. Unaware, without noticing.

careless

• adj. (archaic) Free from care; unworried, without anxiety.
• adj. Not concerned or worried (about).
• adj. Not giving sufficient attention or thought, especially concerning the avoidance of harm or mistakes.

deaf

• adj. Unable to hear, or only partially able to hear.
• adj. Unwilling to listen or be persuaded; determinedly inattentive; regardless.
• adj. Obscurely heard; stifled; deadened.
• adj. (obsolete, Britain, dialect) Decayed; tasteless; dead.
• n. A deaf person.
• n. (with "the") Those who are deaf, taken as a group.
• v. (obsolete, transitive) To deafen.

indifferent

• adj. Not caring or concerned; uninterested, apathetic.
• adj. Mediocre, usually used negatively in modern usage.
• adj. Having no preference or bias, being impartial.
• adj. Not making a difference; without significance or importance.
• adj. (mechanics) Being in the state of neutral equilibrium.
• adv. (obsolete) To some extent, in some degree (intermediate between very and not at all); moderately, tolerably,…

reckless

• adj. Careless or heedless; headstrong or rash.
• adj. Indifferent to danger or the consequences.

regardless

• adj. Having no regard; heedless; careless.
• adv. Without attention to warnings or indications of bad consequences.
• prep. Paying no attention to; regardless of.

thoughtless

• adj. Marked by or showing lack of due thought or care; careless.
• adj. Inconsiderate, inattentive.
• adj. Lacking thought or consideration.

unheeding

• adj. Showing disregard.