Consisting of or making up a large mass; bulky, heavy, and solid: a massive piece of furniture.
Large or imposing, as in quantity, scope, degree, intensity, or scale: "Local defense must be reinforced by the further deterrent of massive retaliatory power” ( John Foster Dulles). See Synonyms at heavy.
Large in comparison with the usual amount: a massive dose of a drug.
Pathology Affecting a large area of bodily tissue; widespread and severe: massive gangrene.