overwhelmˈ transitive verb

1. To crush completely with something heavy or strong
2. To flow over
3. To bear down
4. To reduce to helplessness
5. To overpower
6. To affect overpoweringly
7. To defeat utterly, usu with superior numbers
8. To inundate or submerge, esp suddenly
9. To overhang (obsolete)

overwhelˈming noun and adjective

overwhelˈmingly adverb

overwhelˈmingness noun