Underpined or Underpinned: How To spell?

The word Underpined is misspelled against Underpinned, which is past tense of "Underpin"

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