[cvt]

are "describing" words. We draw up lots of lists with adjectives in class. As PP said, pointing them out in a story or book helps, but you also may try to make a graphic organizer with the five senses. Take any object (ball, pig, flower, cookie, pretzel) and have the students describe it using their senses (sweet, pink, crunchy, etc.). Take those words and write them on the adjectives list for the students to consult later in their writing.
When I do read-alouds, I try to find stories with lots of adjectives, and I ask students to listen for them so we can write them down after the story.