The word "bluntest" can be replaced with several different synonyms depending on the context and tone of the sentence. Some suitable replacements for "bluntest" include: most straightforward, most unabashed, most outspoken, most unequivocal, most candid, most direct, most forthright, most frank, most stark, most bald, and most plain-spoken. These synonyms all share a commonality in their ability to convey a clear and uncompromising message, without any sugarcoating or ambiguity. Choosing the right synonym will depend on the specific situation in which the word is being used, as well as the intended effect on the audience.