To fully understand how to define a predicate adjective, one needs to understand both the the terms predicate and adjective first.
A sentence is typically broken into two parts: a subject and a predicate. The subject is what the sentence is about and the predicate tells the reader something about the subject. In regards to the question at hand, the predicate is identified by bold face:
The chair is odd-looking, but comfortable.
The subject of the sentence is the chair (what the sentence is about). The predicate of the sentence describes the chair (it is odd-looking and comfortable).
An adjective is a describing word. For example, the chair is described as being odd-looking and comfortable.
A predicate adjective, by definition, follows a linking verb (in this case is) and tells readers something about the subject (how the chair appears).
Therefore, you are correct. The predicate adjectives in the sentence are odd-looking and comfortable given they both describe the object named in the subject of the sentence.