The word "knottily" is often used to describe something that is difficult to understand or untangle. Synonyms for this word might include words like "complex," "intricate," "complicated," or even "convoluted." Other synonyms for "knottily" might include phrases like "hard to unravel," "tangled up," or "gridlocked." Depending on the context in which you are using this word, other possible synonyms might include things like "problematic," "challenging," or "troublesome." Ultimately, the word "knottily" is just one way of describing a particular kind of complexity or difficulty, and there are many different ways to express this idea using different words and phrases.