masivan

1. massive; bulky
   Ispred zgrade stoje masivna drvena vrata. — There are massive wooden doors at the front of the building.
2. (of wood, metal) solid
   Kupili smo sto od masivnog hrasta. — We bought a solid oak table.
3. (of an attack, bleeding, investment) massive; large-scale
   Sajt je pretrpeo masivan hakerski napad. — The website suffered a massive hacker attack.

Collocations such as masivan napad, masivno krvarenje, masivna investicija are established. But when many people are involved (mass protests, mass support), standard Serbian usually uses masovan (masovni protesti, masovna podrška); masivan there is a calque of English massive found in journalism.