- modify nouns

Formal(morphological) characteristics
+suffixes (-ful, -less, -ive)
prefix + (un-)
gradable (very, less, ..)
comparative, superative endings
absolute form - comparative form - superative form
analytic comparative and superative form : more, most (2 or more syllables)

Distributional characteristics
-typically occupy 2 positions
attributive position : adj. + N, N + adj. (post-nominal attributive position)
predicative position
linking verb(copula) + adj.
ex)She is beautiful.
    > predicated of the referent of another constituent (she)
-APs (adjective function as the Head of APs)
[AP extremely happy to be here]
         Head   complement
- AP can occur within NP
[NP the [AP happy] actor ]