þroskaheftur

Etymology
🇰🇲

Adjective

 * 1)  mentally disabled, mentally retarded, mentally handicapped
 * 2)  retard, imbecile, idiot, person who has made a foolish mistake
 * 1)  retard, imbecile, idiot, person who has made a foolish mistake

Usage notes
In common use in the 2000s decade having overtaken, was later overtaken by.