arbitrary
ar•bi•trary 
BrE /ˈɑːbɪtrəri/
BrE /ˈɑːbɪtri/NAmE /ˈɑːrbətreri/
adjective
word origin
The choice of players for the team seemed completely arbitrary.He makes unpredictable, arbitrary decisions. 2 (formal) using power without restriction and without considering other peoplethe arbitrary powers of officials 
ar•bi•trar•ily /BrE ˌɑːbɪˈtrerəli; ˈɑːbɪtrəli; NAmE ˌɑːrbəˈtrerəli/ adverbThe leaders of the groups were chosen arbitrarily.The political frontiers in Africa were often arbitrarily drawn up by the old colonial powers. ar•bi•trari•ness /BrE ˈɑːbɪtrərinəs; ˈɑːbɪtrinəs; NAmE ˈɑːrbətrerinəs/ noun [uncountable]Court officials were suspected of arbitrariness and personal bias.
