1The artist's use of abstract forms and vibrant colours created an unfathomable sense of depth and emotion in the viewer.
2The philosopher's theory of consciousness was so unfathomable that even his closest colleagues struggled to grasp its implications.
3The unfathomable cruelty of the dictator's regime left the international community shocked and outraged.
4As she delved deeper into the novel, she found the protagonist's motivations increasingly unfathomable, yet strangely compelling.
5There is something unfathomable about the human capacity for both good and evil, a paradox that has puzzled philosophers and theologians for centuries.