To describe a person or a thing by using two or more i-adjectives in one sentence, use くてのかたち, or the kute-form, of i-adjectives for all the i-adjectives except the last one.
[Something long and cylindrical is] thick and heavy.
この ボールペンは かるくて、ほそくて、やすいです。
This ball-point pen is lightweight, slim, and inexpensive.