adjectival       
adjective uk/ˌædʒ.ekˈtaɪ.vəl/ us/ˌædʒ.ekˈtaɪ.vəl/
 形容词的
containing, being, or relating to an adjective
  an adjectival phrase 一个形容词短语 
 Alkaline is the adjectival form of the noun alkali.  “碱性的”是名词“碱”的形容词形式。 
 He hardly ever uses a noun without an adjectival modifier. 他几乎从不使用没有形容词修饰语的名词。 
 See: adjective
 - More examples
 - She uses a lot of adjectival phrases in her writing.
 - “Hispanic” is now applied in adjectival form to a vast and diverse ethnic group in the US.