DISCOURTEOUSLY BRIEF is a phrase that describes a manner of speaking or writing that is both polite and concise. The two crossword solutions, CURT (4 letters) and TERSE (5 letters), are synonyms for this phrase. CURT means abrupt or brusque in a way that is considered rude, while TERSE means using few words to express something clearly and effectively. Both words describe a style of communication that is polite but brief.