adj, slang ·Moderate ·High school level

Definitions

Adjective

1. 1
   Insane or emotionally deranged, either temporarily or permanently. informal, obsolete
2. 2
   Affected by or exhibiting an unusual or dreamy sentimentality. informal, uncommon

Synonyms

All synonyms

5150apeshitbakedbananasbarkingbarking mad

Etymology

From moon + sick.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.