239 Words to Try to Use in Colloquial Speech Without Sounding Like a Pretentious Ass

For example:

• truculent
  

• sophiology
  

• syncretion
  

• theophanic
  

• noetic
  

• festinate
  

• flibbertigibbet
  

• callithump
  

• insouciance
  

• exiguous
  

The rest are at Wordnik.