The phrase "defying description" can be used to describe something that is difficult to put into words, but there are other similar phrases and synonyms that can be used instead. Some possible alternatives include "beyond words," "indescribable," "unutterable," "inexpressible," "incomprehensible," "baffling," "mystifying," "unfathomable," "enigmatic," and "unnerving." Each of these phrases captures the idea that something is difficult to describe, either because it is too complex, too emotional, or too abstract to put into words. Whether describing a work of art, a natural wonder, or a personal experience, these synonyms and phrases can help convey the depth and complexity of the subject at hand.