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In "the red apple," red is an adjective.
In "the large house" or "the house is large," large is the adjective.
In "the beautiful bird," if we said "The bird is beautiful," beautiful is still an adjective.
In "the slimy worm," slimy is an adjective.
In "the colorful bird," colorful is the adjective.
In "the warm day," or "the day is warm," warm is an adjective because it describes what kind of day it is.