lost on someone Definition

lost¹
adj

1a. Missing;

Example: the lost child
Thesaurus: misplaced, mislaid, missing, hidden, obscured, forfeited.
1b. Having gone astray;

Example: a lost cat
1c. No longer found, done or practised;

Example: the lost art of conversation
1d. Unable to find one's way.
2. Confused; puzzled.

Thesaurus: perplexed, baffled, bewildered, confused.
3. Said especially of soldiers or people at sea: missing and presumed dead or drowned.
4. Wasted.

Example: made up for lost time
5a. old use
Lacking in morals;
Example: lost women
5b. old use
Damned.
Example: lost souls

Idiom: get lost

To go away and stay away.

Used to express mild derision.
Example: Oh, get lost! You don't really mean that

Idiom: lost and found

A column in local newspapers where people who have either lost something or found something can advertise.

Idiom: lost in something

Absorbed in it.
Example: She was completely lost in thought

Hidden, indistinguishable, camouflaged, etc in or by it.

Idiom: lost on someone

Not appreciated or understood by them.
Example: The joke about the lizard was lost on her

Idiom: lost to someone

No longer open or available to them.

Idiom: lost to something

No longer capable of feeling (an emotion), or of responding morally or rationally.

Etymology: 16c: past participle of lose.