a.

1. 迂迴的，彎曲的
   take a devious route to avoid busy streets

   繞道而行，避開熙攘的街道

2. 離開正道的；步入歧途的
3. 不光明正大的；不坦率的；欺詐的
   He got rich by devious means.

   他靠不正當手段發了財。

adj.

1. skilfully using underhand tactics to achieve goals.
2. (of a route or journey) longer and less direct than the most straightforward way.