Trienially or Triennially: How To spell?

The word Trienially is misspelled against Triennially, an adverb meaning "Once in three years."

Triennially has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings trie & ially which should not be misspelled with single 'N'
Wrong Spelling: trie-n-ially
Correct Spelling: trie-nn-ially
Find more wrongly spelled words of Triennially to spell it well.