ETYM Latin blandus, of unknown origin.
1. Lacking either stimulating or irritating characteristics.
2. Lacking stimulating characteristics; uninteresting; SYN. flat.
3. Lacking taste or flavor or tang; SYN. flat, flavorless, flavourless, insipid, savorless, vapid.

1. Conveying or resembling a compliment.
2. Costing nothing; SYN. costless, free, gratis, gratuitous.

ETYM Old Eng. cortais, corteis, cortois, rarely corteous, Old Fren. corties, corteis, French courtois. Related to Court.
1. Characterized by courtesy and gracious good manners.
2. Exhibiting courtesy and politeness; SYN. gracious, nice.

ETYM Old Eng. debonere, Old Fren. de bon aire, debonaire, of good descent or lineage, excellent, debonair, French débonnaire debonair; de of (Latin de) + bon good (Latin bonus) + aire. Related to Air, and Bounty, Bonair.
Having a sophisticated charm; SYN. debonaire, debonnaire, suave.

Pleasant and courteous in speech

Showing regard for others in manners, speech, behavior, etc.
Showing or characterized by correct social usage; marked by an appearance of consideration, tact, deference, or courtesy; marked by a lack of roughness or crudities

Characterized by tact and propriety.

In a bland manner.

In a civil manner.

In a complimentary manner, with praise and admiration

In a courteous manner.

Courteously; jauntily, in a lively manner

In a polite manner; SYN. courteously, with courtesy, in a well mannered way, with politeness.

In an urbane manner.