arduous (a) (effort) | trabajoso (a) (effort) |
arduous (a) (effort) | duro (a) (effort) |
arduous (a) (effort) | penoso (a) (effort) |
arduous (a) (effort) | difícil (a) (effort) |
arduous (a) (effort) | laborioso (a) (effort) |
arduous (a) (effort) | arduo (a) (effort) |
arduous (a) (effort) | dificultoso (a) (effort) |