From Wiktionary, the free dictionary
waśa (“power, force; dominion”) + ka- -(a)n.
kawaśan
- overpowered, dominated, mastered, subdued
- "kawaśan" in P.J. Zoetmulder with the collaboration of S.O. Robson, Old Javanese-English Dictionary. 's-Gravenhage: M. Nijhoff, 1982.