The term 'Vague Sense' can be broken down into two crossword solutions: VIBE (4 letters) and PERP (4 letters). VIBE is an informal term used to describe a feeling or atmosphere, while PERP is an abbreviation for perpetrator, which is someone who has committed a crime or an offense. Together, these two words can be used to describe a feeling of unease or suspicion that something wrong has happened or is about to happen.