EXTREME (5 letters) The crossword solutions for the term 'very heavy' are 'OBESE' and 'EXTREME'. OBESE is a medical term used to describe someone who is significantly overweight, usually having a body mass index (BMI) of 30 or higher. EXTREME is a term used to describe something that is at the highest level of intensity or magnitude. Therefore, the two words together can be used to describe someone who is extremely overweight.