the.com/killjoy

The one person always ready to remind the room that fun has consequences.

means A person who spoils others' enjoyment or enthusiasm, often by pointing out problems, risks, or reasons to stop.

from A straightforward compound from the 1700s, built exactly as it sounds: 'kill' plus 'joy.' English loves making nouns this way — think 'spoilsport' or 'wet blanket' — stitching together a verb and its victim into one blunt little job title. No hidden language, no buried myth, just two plain words doing exactly what they say on the tin.

origin
Literally means someone who kills joy, 1700s English
social role
Often just the only sober person present
synonym
Wet blanket, party pooper, buzzkill
secret truth
Usually just correct, which is the real insult
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