Synonyms of the word

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.

artless

• adj. Having or displaying no guile, cunning, or deceit.
• adj. Free of artificiality; natural.
• adj. Lacking art, knowledge, or skill; uncultured and ignorant.
• adj. Poorly made or done; crude.

casual

• adj. Happening by chance.
• adj. Coming without regularity; occasional or incidental.
• adj. Employed irregularly.
• adj. Careless.
• adj. Happening or coming to pass without design.
• adj. Informal, relaxed.
• adj. Designed for informal or everyday use.
• n. (Britain, Australia, New Zealand) A worker who is only working for a company occasionally, not as its…
• n. A soldier temporarily at a place of duty, usually en route to another place of duty.
• n. (Britain) A member of a group of football hooligans who wear expensive designer clothing to avoid police…
• n. One who receives relief for a night in a parish to which he does not belong; a vagrant.
• n. (video games, informal) A player of casual games.
• n. (dated) (Britain) A tramp.

cursory

• adj. hasty; superficial; careless.
• adj. (obsolete) Running about; not stationary.

haphazard

• adj. random; chaotic; incomplete; not thorough, constant, or consistent.

heedless

• adj. Unaware, without noticing.

imprudent

• adj. Not prudent; wanting in prudence or discretion; indiscreet; injudicious; not attentive to consequence;…

inattentive

• adj. Of or pertaining to lack of attention; not paying attention; careless.

incautious

• adj. careless, reckless, not exercising proper caution.

negligent

• adj. Careless, without appropriate or sufficient attention.
• adj. (law) Culpable due to negligence.

offhand

• adj. without planning or thinking ahead.
• adj. careless; without sufficient thought or consideration.
• adj. curt, abrupt, unfriendly.
• adv. right away, immediately, without thinking about it.
• adv. in an offhand manner.

offhanded

• adj. in a casual or curt style, without preparation or thought; Impromptu, offhand.

passing

• v. present participle of pass.
• adj. That passes away; ephemeral.
• adj. (now rare, literary) Pre-eminent, excellent, extreme.
• adj. vague, cursory.
• adj. going past - passing cars.
• adv. (now literary or archaic) Surpassingly, greatly.
• n. Death, dying; the end of something.
• n. The fact of going past; a movement from one place to another or a change from one state to another.
• n. (law) The act of approving a bill etc.
• n. (sports) The act of passing a ball etc. to another player.
• n. A form of juggling where several people pass props between each other, usually clubs or rings.

perfunctory

• adj. Done merely to discharge a duty; performed mechanically and as a thing of rote; done in a careless and…

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.

slapdash

• adj. Produced or carried out hastily; haphazard; careless.
• adv. In a hasty or careless manner.
• adv. Directly, right there; slap-bang.
• adv. With a slap; all at once; slap.
• v. (colloquial) To apply, or apply something to, in a hasty, careless, or rough manner; to roughcast.

slipshod

• adj. Done poorly or too quickly; slapdash.
• adj. (obsolete) Wearing slippers or similarly open shoes.

sloppy

• adj. Very wet; covered in or composed of slop.
• adj. Messy; not neat, elegant, or careful.
• adj. Imprecise or loose.

superficial

• adj. Shallow, lacking substance.
• adj. At face value.
• adj. Of or pertaining to the surface.
• adj. Being near the surface.
• adj. (rare) Two-dimensional; drawn on a flat surface.
• n. (chiefly in plural) A surface detail.

thoughtless

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

unconcerned

• adj. Indifferent and having no interest; aloof.
• adj. Not worried, anxious or apprehensive.

unheeding

• adj. Showing disregard.