adjective
humongous
hyoo-MUNG-gus/hjuːˈmʌŋɡəs/
Extremely large in size or amount.
The humongous pumpkin dwarfs both the person and ordinary pumpkin beside it.

Etymology
Humongous is apparently a playful mash-up of huge and monstrous. Monstrous already meant “enormous,” so the proposed blend combines two expressions of exceptional size.
In context
That's like Avogadro's number is humongous. There's a huge number of particles.
More examples
- The restaurant serves humongous portions of pasta.
- Repairing the roof costs a humongous amount of money.
- That humongous couch barely fits through the door.
Forms
humongous
Similar words
- enormous
- Fits both size and amount, with a less informal tone.
- gigantic
- Often emphasizes towering physical size rather than sheer amount.