Definition of portentive in US English:

portentive

adjective

rare
  • Having the quality or nature of a portent; ominous, prophetic.

Origin

Late 16th century; earliest use found in Thomas Nashe (d. c1601), writer. From classical Latin portent-, past participial stem of portendere portend + -ive.

Pronunciation

portentive

/pɔːˈtɛntɪv/