Arbitrary
/ˈɑːr.bɪ.trer.i/
Synonyms
- capricious
- erratic
- random
- unpredictable
- haphazard
Slang Meanings
Totally random or without explanation.
That policy change was so arbitrary; no one saw it coming.
Made up on the spot.
His justification for the curfew felt arbitrary and out of nowhere.