overwhelmed

Concise Oxford English Dictionary © 2008 Oxford University Press:
overwhelm/əʊvəˈwelm/

▶verb

• 1 bury or drown beneath a huge mass.

  ■ give too much of something to: they were overwhelmed by letters.

• 2 have a strong emotional effect on.

• 3 defeat completely; overpower.

– derivatives
overwhelming adjective,
overwhelmingly adverb,
overwhelmingness noun.