Un-subtle is a commonly used word that means something is not nuanced or delicate. There are many synonyms for this term such as blatant, obvious, overt, glaring, and flagrant. If you're looking for a stronger synonym, you could use the word brazen, audacious or even shameless. Sometimes, you might be in need of a less severe synonym, in that case, you could choose to use words like forthright, frank or candid. Ultimately, it all depends on the context of the sentence you're trying to use the word in, and the message that you want to convey.