strenuous (a) (effort) | difícil (a) (effort) |
strenuous (a) (behavior) | activo (m) (a) (behavior) |
strenuous (a) (effort) | dificultoso (a) (effort) |
strenuous (a) (effort) | penoso (a) (effort) |
strenuous (a) (effort) | laborioso (a) (effort) |
strenuous (a) (behavior) | vigoroso (a) (behavior) |
strenuous (a) (effort) | trabajoso (a) (effort) |
strenuous (a) (effort) | arduo (a) (effort) |