The word "in cogitable" means something that is impossible to imagine or comprehend. The antonyms for this word, therefore, would be words that imply that something is easily understandable or imaginable. These words could include "cognizable," which means capable of being understood or perceived, "conceivable," which suggests that something is capable of being imagined or believed, or "comprehensible," which signifies that something is able to be grasped intellectually. Other suitable antonyms could be "imaginable," "fathomable," "conceivable," or "plausible," all of which suggest that something is understandable, knowable, and comprehensible. By using these words as antonyms, one can create a contrast between the incomprehensible and the easily understandable.