noun, masculine/kɔ̃.ple.mɑ̃ siʁ.kɔ̃s.tɑ̃.sjɛl/plural: compléments circonstanciels
complément circonstanciel is masculine in French.
circumstantial complement (a syntactic element describing place, time, manner, or a variety of other specific details related to a superordinate verbal element)