The word "thetic" means relating to or expressed in a simple, clear, and direct way. Some synonyms for this word include explicit, definite, categorical, unequivocal, and unambiguous. Other similar words that can be used in place of "thetic" include plain, straightforward, apparent, evident, obvious, and manifest. It is important to use the right synonym based on the context of the sentence to ensure clarity and comprehension. For example, one could say "the instructions were categorical" or "the evidence was unequivocal" to convey the same meaning as "the instructions were thetic." Overall, using these synonyms can help improve the precision and impact of your writing.