oomkullrunkelig

o- (“un-”) +‎ omkull (“to the ground or floor”) +‎ runka (“shake”) +‎ -e- +‎ -lig (“-able”)

oomkullrunkelig (not comparable)

1. (often humorous) irrefutable, unshakable, that cannot be toppled

   Synonyms: obestridlig, orubblig

   en oomkullrunkelig sanning

   an irrefutable truth

   Han är oomkullrunkelig i sin övertygelse

   He is unshakable in his conviction

   • 1836 February 25, “Theater: Diamanten och Hobergsgubben [Theatre: The Diamond and Old Man Hoburg]”, in Dagligt Allehanda, page 2:

     Men här anses nu Sophies oskuld ha blifvit oomkullrunkeligen stadfästad genom denna nyckel.

     But here, Sophie's innocence is now deemed unassailably confirmed through this key.

   • 2023 September 24, Jan Guillou, “Det våras för monarkin [The monarchy is showing signs of spring."]”, in Aftonbladet:

     Och vad värre är så är det inte bara i de sen länge etablerade kungadömena i Västeuropa som rojalismen synes stå oomkullrunkeligt stabil.

     And what's worse is that it's not only in the long-established kingdoms of Western Europe that royalism seems unassailably stable.

Often considered a quirky word by native speakers, both for its intricate nature and for using the word runka (“jerk off, shake”) in its archaic sense.

• oomkullrunkelig in Svensk ordbok (SO)
• oomkullrunkelig in Svenska Akademiens ordlista (SAOL)
• oomkullrunkelig in Svenska Akademiens ordbok (SAOB)