What is a proper adjective?
A proper adjective is formed from a proper noun and is typically capitalized.
Proper adjectives include terms derived from locations, languages, and ethnicities (e.g., “Bostonian,” “Sino-Tibetan,” “South Asian”); individuals’ names (such as “Keynesian,” “Darwinian,” “Newtonian”); and religious terms (e.g., “Rastafarian,” “Christian,” “Talmudic”) among other proper nouns.