4. Not unlike – This strange expression, in a way, cancels itself out as a double negative. For example, someone may say, “This car is not unlike that one.” If you put a few of those sorts of expressions into a sentence, trying to figure out exactly what the sentence means can make your head explode. In fact, it strains the meaning of the word “sentence,” which refers to a string of words that makes sense. Unless the person misspoke, this seems to just be a fancy way of saying, “This car is like that one.” Try to avoid making heads explode by not using the expression, “not unlike.”In his essay Politics and the English Language, George Orwell lambasted the "not un-" formation. "A not unblack dog chased a not unsmall rabbit across a not ungreen field."
My most hated neologism is "You need to..." or "I need you to..." in the sense of "I want you to..."
Regards,