Synonyms of the word

courteous

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

chivalrous

• adj. (of a man) honourable, especially to women.
• adj. involving chivalry.

gallant

• adj. Brave, valiant.
• adj. Honorable.
• adj. Grand, noble.
• adj. (obsolete) Showy; splendid; magnificent; gay; well-dressed.
• adj. Polite and attentive to ladies; courteous to women; chivalrous.
• n. (dated) Fashionable young man, who is polite and attentive to women.
• n. One who woos, a lover, a suitor, a seducer.
• n. An animal or thing of grey colour, such as a horse, badger, or salmon.
• n. (nautical) topgallant.
• v. (obsolete, transitive) To attend or wait on (a lady).
• v. (obsolete, transitive) To handle with grace or in a modish manner.

gracious

• adj. kind and warmly courteous.
• adj. tactful.
• adj. compassionate.
• adj. indulgent, charming and graceful.
• adj. elegant and with good taste.
• adj. benignant.
• adj. full of grace.
• interj. expression of surprise, contempt, outrage, disgust, boredom, frustration.

knightly

• adj. Of or pertaining to a knight or knights.
• adj. Befitting a knight; formally courteous (as a knight); chivalrous, gallant and courtly.
• adv. In the manner of a knight; chivalrously.

nice

• adj. (obsolete) Silly, ignorant; foolish.
• adj. (now rare) Particular in one's conduct; scrupulous, painstaking; choosy.
• adj. (obsolete) Particular as regards rules or qualities; strict.
• adj. Showing or requiring great precision or sensitive discernment; subtle.
• adj. (obsolete) Doubtful, as to the outcome; risky.
• adj. Respectable; virtuous.
• adj. Pleasant, satisfactory.
• adj. Of a person: friendly, attractive.
• adj. With "and", shows that the given adjective is desirable: pleasantly.
• adv. (colloquial) Nicely.
• interj. Used to signify a job well done.
• interj. Used to signify approval.
• v. (transitive, computing, Unix) To run a process with a specified (usually lower) priority.

polite

• adj. Well-mannered, civilized.
• adj. (obsolete) Smooth, polished, burnished.
• v. (obsolete, transitive) To polish; to refine; to render polite.

respectful

• adj. Marked or characterized by respect.