The term 'lacking vitality' can be described by a variety of words, such as 'EFFETE' (6 letters), 'ANAEMIC' (7 letters), 'ENERVATED' (9 letters), 'STATIC' (6 letters), 'PALLID' (6 letters), 'ANEMIC' (6 letters), and 'FLAT' (4 letters). These words all describe a lack of energy, life, or vigor. EFFETE means weak or ineffectual, ANAEMIC and ANEMIC refer to a lack of blood or vitality, ENERVATED means exhausted or weakened, STATIC implies a lack of movement or progress, and PALLID and FLAT suggest a lack of color or emotion.