The term 'lacking in vitality' can be described by two crossword solutions: ANEMIC (6 letters) and PALE (4 letters). ANEMIC is a medical term used to describe a person who has a lower than normal number of red blood cells or hemoglobin, which can lead to fatigue, dizziness, and paleness. PALE is a color that is lighter than usual, often associated with a lack of energy or vitality. Both terms are used to describe someone who is lacking in vitality.