sinnssyk

• sinnssjuk (Nynorsk also)

sinn (“mind”) +‎ -s- +‎ syk (“sick, ill”). Compare Danish sindssyg, Swedish sinnessjuk.

• IPA^(key): /ˈsins.ˌsyːk/, [ˈsɪns.ˌsyːk]

sinnssyk (masculine and feminine sinnssyk, neuter sinnssykt, definite singular and plural sinnssyke, comparative mer sinnssyk, superlative mest sinnssyk)

1. (dated, colloquial, often derogatory) insane; not sound of mind

   Synonyms: gal, sinnssvak, sinnsforvirret, sinnsforvirra

2. (figurative) absurd

   Synonyms: vanvittig, absurd

3. (figurative, colloquial) insane, extreme

   Det var en sinnsyk fart på hun når hun kom rundt svingen

   She had an insane speed when she came around the bend

• sinnssyke, sinnssjuke (“insanity; mental illness”)

• sinnssykeasyl, sinnssykehus (“mental hospital”)
• sinnssykdom (“mental illness”)
• sinnsykt (“extremly”) (adverb)

• åndssvak (“mentally retarded”) (Nynorsk also)

• “sinnssyk” in The Bokmål Dictionary.
• “sinnssyk” in Det Norske Akademis ordbok (NAOB).