Is gracious opposite in meaning of brusque?

Yes it is, depending on how you are using the Word gracious. Gracious means1. pleasantly kind, benevolent, and courteous.

2. characterized by good taste, comfort, ease, or luxury: gracious suburban living; a gracious home.

3. indulgent or beneficent in a pleasantly condescending way, esp. to inferiors.

4. merciful or compassionate: our gracious king.

5. Obsolete . fortunate or happy friendly, favorable, polite. tender, clement, mild, or gentle.

Synonyms are benign, friendly, favorable, polite. kind, tender, clement, mild, gentle.

While brusque means unceremonious, short, curt, or blunt. Which is an antonym for gracious some times when it is used to mean tender, mild, gentle, friendly, or polite.

(Definitions and synonyms from Dictionary.com)