This would be
a MASSIVE undertaking...
The Big Bang Theory Season 3, Episode 10
It's not MASSIVE.
The Big Bang Theory Season 11, Episode 15
then a super MASSIVE
black hole could work.
The Big Bang Theory Season 9, Episode 14
a MASSIVE inferiority complex.
The Big Bang Theory Season 11, Episode 15
You come face to face
with a MASSIVE monster
The Big Bang Theory Season 12, Episode 16