When multiple adjectives refer to the same noun, the adjective(s) other than the last one are usually written in the て-form:
① 大きくて重い本
However writing all adjectives in their い-form is not (necessarily?) incorrect either AFAIK.
② 大きい重い本
Can anyone shed some light as to how they differ in meaning/nuance, and why and when anyone would opt for form ②?