WordWeb Online

1. Become filled with uncontrollable emotion or too much sensory input
   "overwhelmed with grief";
   - overpower, sweep over, whelm [archaic], overcome, overtake
    
2. Charge someone with too many tasks
   - deluge, flood out
    
3. Cover completely or make imperceptible
   - submerge, drown
    
4. Overcome by superior force
   - overpower, overmaster

Derived forms: overwhelmed, overwhelms, overwhelming

Type of: arouse, beat, beat out, burden, charge, cover, crush, elicit, enkindle, evoke, fire, kindle, provoke, raise, saddle, shell, spread over, trounce, vanquish