Uncompromisingness is a word that describes someone or something that is completely unwilling to make concessions or compromise in any way. Some synonyms for this word could include stubbornness, inflexibility, rigidity, steadfastness, and obstinacy. Another way to describe someone who is uncompromising may be to say that they are determined, resolute, unyielding, immovable, or adamant in their beliefs or actions. Additionally, other words like intransigence, dogmatism, and intractability may also be used to describe someone who is unwilling to compromise or change their stance. Overall, there are many different words that can be used to describe someone or something that exhibits uncompromisingness.