Difference between Careless and Offhanded

CARELESS vs OFFHANDED: ADJECTIVE

Effortless and unstudied
Showing an unthinking lack of consideration
Taking insufficient care; negligent.
Marked by or resulting from lack of forethought or thoroughness.
Showing a lack of consideration.
Unconcerned or indifferent; heedless.
Unstudied or effortless.
Exhibiting a disposition that is free from cares; cheerful.
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

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

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

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

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.
Find more similar flip PDFs like Careless Whisper, and Last Christmas Careless.

Christmastime when his great aunt Blanche made some offhanded comment about which uncle played what part what year back when they were kids.
While employees were enthusiastic about the variety of ways in which gratitude can be expressed, they were not moved by empty or offhanded gestures.
To the feed Dragon AGE RPG tales of the Old Margreve offhanded recommended to me because I like noir.
This is not an area for practical jokes or offhanded comments, as recent events demonstrate the importance of investigating thoroughly all potential concerns.
The remark is an offhanded comment in an otherwise thoughtful body of writing.
As a swede i take offence at this arrogant offhanded discussion.