Adjective
A word describing a noun. Generally eschewed in legal drafting, but not quite as assiduously as are adverbs. Adverbs are are viewed with horror in legal circles, having only literary, but no forensic merit. Adjectives are more of a necessary evil.
Sometimes adjectives can be quite handy, even to a curmudgeon, and in rare cases carry all the semantic content of an adjectival phrase. If you take the adjectives out of “a commercially reasonable manner” you are not left with much at all: “The parties shall act in a manner at all times” would irk even a well-bred attorney.