arduous (a) (effort) | ardu (a) (effort) |
arduous (a) (effort) | épuisant (a) (effort) |
arduous (a) (effort) | laborieux (a) (effort) |
arduous (a) (effort) | lourd (a) (effort) |
arduous (a) (effort) | pénible (a) (effort) |
arduous (a) (effort) | dur (m) (a) (effort) |
arduous (a) (effort) | difficile (a) (effort) |