1) Adjective 2) Major form class 
• (a.) Of or relating to the relating to the adjective; of the nature of an adjective; adjective.
Ad`jec·ti'val adjective Of or relating to the relating to the adjective; of the nature of an adjective; adjective. W. Taylor (1797) 
(Adjective (adjectival)) A word class which contains words that can add more detail (i.e. modify) to a noun or pronoun - e.g. the busy teacher (pre-modification) it was awful (post-modification). Adjectives are gradable depending on whether a comparison is made with one other thing or many other things: big, bigger, biggest difficult, more difficul...
[adj] - of or relating to or functioning as an adjective
adjective adjective of or relating to or functioning as an adjective; `adjectival syntax`; `an adjective clause`
of, pertaining to, or used as an adjective. · describing by means of many adjectives; depending for effect on intensive qualification of subject matter, as a writer, style, or essay.