supererogant
/ˌsuːpəˈrɛrəɡ(ə)nt/ /ˌs(j)uːpəˈrɛrəɡ(ə)nt/Now rare
adjective
Going beyond what is needed or required, superfluous.
Origin
Late 16th century. From post-classical Latin supererogant-, supererogans, present participle of supererogare supererogate.