Courteous \Cour"te*ous\ (k?r"t?-?s; 277), a. [OE. cortais, corteis, cortois, rarely corteous, OF. corties, corteis, F. courtois. See Court.]

Of courtlike manners; pertaining to, or expressive of, courtesy; characterized by courtesy; civil; obliging; well bred; polite; affable; complaisant. [1913 Webster]

A patient and courteous bearing. --Prescott. [1913 Webster]

His behavior toward his people is grave and courteous. --Fuller. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

54 Moby Thesaurus words for "courteous": accommodating, affable, agreeable, amiable, attentive, cap in hand, ceremonious, civil, civilized, clubbable, clubbish, clubby, communicative, companionable, companionate, compatible, complaisant, congenial, considerate, courtly, decorous, deferential, diplomatic, dutiful, fair, fit for society, fond of society, friendly, genial, genteel, gentlemanly, graceful, gracious, gregarious, honorific, hospitable, ladylike, mannerly, obliging, polished, polite, proper, regardful, respectful, sociable, social, social-minded, solicitous, tactful, thoughtful, urbane, well-behaved, well-bred, well-mannered

Source: Moby Thesaurus II by Grady Ward, 1.0
 

courteous adj
1: exhibiting courtesy and politeness; "a nice gesture" [syn: gracious, nice]
2: characterized by courtesy and gracious good manners; "if a man be gracious and courteous to strangers it shows he is a citizen of the world"-Francis Bacon [ant: discourteous]

Source: WordNet (r) 2.0
 

Courteous \Cour"te*ous\ (k?r"t?-?s; 277), a. [OE. cortais, corteis, cortois, rarely corteous, OF. corties, corteis, F. courtois. See Court.]

Of courtlike manners; pertaining to, or expressive of, courtesy; characterized by courtesy; civil; obliging; well bred; polite; affable; complaisant.

A patient and courteous bearing. --Prescott.

His behavior toward his people is grave and courteous. --Fuller.

Source: Webster's Revised Unabridged Dictionary (1913)