Definition of "unergative"

In Section 1 I will discuss the existence of a class of ergative adjectives in Dutch […]. It will be demonstrated that there are a number of arguments supporting the claim that the class of adjectives should be divided into ergative and unergative adjectives. A large number of adjectives that are unergative according to the tests provided in Section 2 appear to be ergative with respect to their argument structure.

2000, Hans Bennis, “Adjectives and Argument Structure”, in Peter Coopmans, Martin Everaert, Jane Grimshaw, editors, Lexical Specification and Insertion (Current Issues in Linguistic Theory; 197), Amsterdam, Philadelphia, Pa.: John Benjamins Publishing Company, pages 27–28

We have seen that Unergatives and Unaccusatives differ in 1) permitting the derivation of an Impersonal Passive, and 2) in licensing purpose clauses, since Unergatives have active subjects, and Unaccusatives do not.

1998, Eloise Jelinek, Voice and Transitivity as Functional Projections in Yaqui, in Miriam Butt and Wilhelm Geuder, eds., “The Projection of Arguments”