Meaning of “arbitrary” - Learner’s Dictionary

arbitrary

adjective us uk /ˈɑːbɪtrəri/

not based on a system or principles and often seeming unfair:

an arbitrary decision
arbitrarily adverb us uk /ˌɑːbɪˈtreərəli/

(Definition of “arbitrary” from the Cambridge Learner’s Dictionary © Cambridge University Press)