unergative
Intransitive and having an agent as its subject.
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.
Where it comes from
From un- + ergative, from the fact that in an ergative-absolutive language, the only case which uniquely identifies a volitional argument is the ergative case, which marks the agent of a transitive verb.
Adapted from the Wiktionary entry unergative (CC BY-SA 4.0).