er·rant 
/ˈerənt/ adjective
/ˈerənt/ adjective 1 always used before a noun a : behaving wrongly
▪ an errant [=unfaithful] husband ▪ an errant cop [=a policeman who has broken the law]
b US : going outside the proper area
▪ an errant calf ▪ an errant motorboat
c US, sports : not going in the intended direction : not accurate
▪ an errant throw/pass/shot 2 : wandering to different places in search of adventure
▪ an errant knight — see also knight-errant
▪ an errant [=unfaithful] husband ▪ an errant cop [=a policeman who has broken the law]
b US : going outside the proper area
▪ an errant calf ▪ an errant motorboat
c US, sports : not going in the intended direction : not accurate
▪ an errant throw/pass/shot
▪ an errant knight — see also knight-errant
Do not confuse errant with arrant.
