Difference between Careless and Perfunctory

CARELESS vs PERFUNCTORY: ADJECTIVE

Marked by or resulting from lack of forethought or thoroughness.
Showing a lack of consideration.
Unconcerned or indifferent; heedless.
Unstudied or effortless.
Taking insufficient care; negligent.
Exhibiting a disposition that is free from cares; cheerful.
Showing an unthinking lack of consideration
Effortless and unstudied
Free from care or anxiety. hence, cheerful; light-hearted.
Having no care; not taking ordinary or proper care; negligent; unconcerned; heedless; inattentive; unmindful; regardless.
Without thought or purpose; without due care; without attention to rule or system; unstudied; inconsiderate; spontaneous; rash.
(usually followed by `of') without due thought or consideration
Marked by lack of attention or consideration or forethought or thoroughness; not careful

As a formality only
Hasty and without attention to detail; not thorough
Done routinely and with little interest or care.
Acting with indifference; showing little interest or care.
Done merely to get rid of a duty; performed mechanically and as a thing of rote; done in a careless and superficial manner; characterized by indifference.
Hence: Mechanical; indifferent; listless; careless.
Done merely to discharge a duty; performed mechanically and as a thing of rote; done in a careless and superficial manner; characterized by indifference; as, perfunctory admonitions; aspiring only to minimum standards.

Synonyms and Supine, Indolent, etc. (see listless); incautious, thoughtless, remiss, forgetful, inconsiderate.
Done or said without care; unconsidered: as, a careless act; a careless expression.
Giving no care; heedless; negligent; unthinking; inattentive; regardless; unmindful.
Free from care or anxiety; hence, undisturbed; cheerful.
Not careful
Not receiving care; uncared for.

Done mechanically or without interest or zeal, and merely for the sake of getting rid of the duty; done in a half-hearted or careless manner, or so as to conform to the letter but not to the spirit; careless; negligent.
Done or produced as a formality only
Not thorough

Casual, Passing, Unheeding, Offhand, Artless, Slapdash, Haphazard, Heedless, Incautious, Slipshod, Inconsiderate, Negligent, Sloppy, Thoughtless, Reckless

Shallow, Cosmetic, Summary, Routine, Hasty, Facile, Overhasty, Flimsy, Superficial, Passing, Pro forma, Careless, Casual, Formal, Cursory

Casual, Passing, Unheeding, Offhand, Artless, Slapdash, Haphazard, Heedless, Incautious, Slipshod, Inconsiderate, Negligent, Sloppy, Thoughtless, Reckless

Shallow, Cosmetic, Summary, Routine, Hasty, Facile, Overhasty, Flimsy, Superficial, Passing, Pro forma, Careless, Casual, Formal, Cursory

The word that occurs to me is careless.
Careless Whisper is beyond all praise and perfection.
Europeans whose governments were inherently careless of liberty.
We are all careless and foolish at times.
My Heart Will Go On and Careless Whisper.
Many accidents have been caused by careless driving.
Careless: Teacher scolded the students for their carelesswork.
White was careless and captured the black queen.
If the criminal charge is reduced to careless boating which is a civil infraction, then the conviction of careless boating is not reportable.
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