[4] Dionysius Thrax in his The Art of Grammar refers to it as orthḗ or eutheîa "straight",[5] in contrast to the oblique or "bent" cases.
Thus, the reference or least marked form of an adjective might be the nominative masculine singular.
The parts of speech that are often declined and therefore may have a nominative case are nouns, adjectives, pronouns and (less frequently) numerals and participles.
Nominative cases are found in Albanian, Arabic, Estonian, Sanskrit, Slovak, Ukrainian, Hungarian, Lithuanian, Georgian, German, Latin, Greek, Icelandic, Old English, Old French, Polish, Serbian, Czech, Romanian, Russian and Pashto, among other languages.
A usage that is archaic in most current English dialects is the singular second-person pronoun thou (accusative thee).