The word "knottiness" refers to a complex, convoluted or tangled situation. To convey a similar meaning, one may use synonyms such as complexity, intricacy, difficulty, entanglement, perplexity, convolution, complication, or confusion. Each of these words describes a situation that is difficult to understand or navigate. For example, a complex legal case may have many intricacies and complications that make it difficult for a layperson to understand. A tangled web of lies can create confusion and perplexity for those trying to unravel the truth. Whatever the situation may be, these synonyms offer alternative ways to describe knotty situations with precision and nuance.