형용사
From Jonathan Gardner's Korean Notebook
명 Adjective verbs, as opposed to 동사 (Action Verbs.)
Sentences must contain a 용언, which is either a 동사 or a 형용사. 형용사 describe the subject, and translated to English, usually mean "to be (adjective)".
If you want to modify a noun within a sentence, then you need to use an Adjective Clause.
If you want to use a 형용사 to describe an action, then simply use the -게 ending.
Note that 형용사 follow slightly different rules than 동사, so you have to remember which are real action verbs, and which are merely describers.
