Imponderability refers to the quality or state of being difficult to be weighed, measured, or evaluated. In this sense, some synonyms for imponderability include intangibility, inscrutability, incomprehensibility, and indescribability. These words all convey a sense of ambiguity or enigma, a quality that is difficult to pin down or understand. Other synonyms for imponderability may include opacity, inscrutableness, and complexity, all of which suggest that the subject at hand is shrouded in mystery or difficult to perceive. Ultimately, imponderability is a term that describes things that are difficult to fully comprehend or evaluate, and any synonym for this term should convey the same sense of inscrutability or complexity.