Learner's definition of MASSIVE
[more massive; most massive]
1 : very large and heavy
The fort had massive walls.
the dog's massive head/jaw
stars more massive than the sun
2 a : large in amount or degree
b : very severe
A massive effort will be required to clean up the debris.
You can find a massive amount of information on the Internet.
The stunt received massive publicity.
a massive collection of baseball cards
a massive heart attack
a massive stroke