The term 'not at all clear' can be described by three crossword solutions: HAZY (4 letters), OPAQUE (6 letters), and MUDDY (5 letters). HAZY implies a lack of clarity or definition, while OPAQUE suggests something that is impossible to see through. MUDDY implies something that is unclear or confused. All three words describe the term 'not at all clear' in different ways, but they all suggest a lack of clarity or understanding.