courteous

adj

1. Showing regard or thought for others; especially, displaying good manners or etiquette.

   “a courteous gentleman   a courteous gesture”

   “Nectar ran / In courteous fountains to all cups outreach'd; / And plunder'd vines, teeming exhaustless, pleach'd / New growth about each shell and pendent lyre; [...]”

   “His exhortations to his assistants to waste no time in getting on with the job, and to be tactful and courteous with those outside the railway service with whom they had to deal, are as apposite today as they were a century ago.”