毫無來由

毫無 haoˊ wuˊ

(None, Not at all, Not in the, There is, Without) Without, Not at all, None, Not in the least, There is no

無來由 wuˊ laiˊ youˊ

(Out of, Without cause, Without reason) Without reason, Without cause, Out of nowhere

來由 laiˊ youˊ

(Cause, Reason) Reason, Cause