The word "unthinkables" refers to things that are beyond imagination or consideration. Some alternatives to this word could be unthinkable, inconceivable, unimaginable, impossible, incredible, beyond belief, far-fetched, implausible, impractical, inconceivable, unattainable, unrealistic, or unfeasible. These synonyms convey a similar idea, that something is so outrageous or unlikely that it is difficult to comprehend. Whether it is breaking the laws of physics or going against societal norms, the word "unthinkable" and its synonyms are reserved for only the most extreme circumstances. While these words may be used sparingly, they are valuable for painting a picture of a situation that is truly extraordinary.