Definition of adjectival in US English:

adjectival

adjective

Grammar
  • Relating to or functioning as an adjective.

    ‘the words are grammatically adjectival’
    ‘the adjectival suffix -y’

Pronunciation

adjectival

/ˌajəkˈtīv(ə)l//ˌædʒəkˈtaɪv(ə)l/