The word "ranky" can have a negative connotation, implying a foul or unpleasant odor. However, there are several synonyms that can convey similar meanings without having the same negative implication. For example, the word "pungent" can describe a strong smell that is not necessarily unpleasant. "Fragrant" or "aromatic" can be used when describing pleasant smells. "Malodorous" suggests a bad or offensive odor. "Fetid" and "foul" are more direct synonyms for "ranky" that imply an unpleasant smell. "Noisome" can also be used to describe a rank or unpleasant odor. In any case, choosing the right synonym can help describe a smell in more detail without offending the reader.