Dictionary

opportuniste

/ɔ.pɔʁ.ty.nist/

adjective/ɔ.pɔʁ.ty.nist/

opportunistic

From opportun + -iste.

noun, masculine/feminine/ɔ.pɔʁ.ty.nist/plural: opportunistes

opportuniste is masculine or feminine depending on context in French.

opportunist (someone who takes advantage of any opportunity to advance their own situation, placing expediency above principle)

From opportun + -iste.