The term MEAN AND NASTY can be broken down into four crossword solutions: SNIDE (5 letters), BASE (4 letters), SYNONYMS (8 letters), and ORNERY (6 letters). SNIDE is an adjective meaning sarcastic or cutting in a way that is intended to hurt someone's feelings. BASE is an adjective meaning morally low or contemptible. SYNONYMS are words or phrases that have the same or nearly the same meaning. ORNERY is an adjective meaning bad-tempered, irritable, or stubborn. Together, these words describe someone who is unkind, cruel, and difficult to deal with.