Thinish or Thinnish: How To spell?
The word Thinish is misspelled against Thinnish, an adjective meaning "Somewhat thin."
Thinnish has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings thi & ish which should not be misspelled with single 'N'
Wrong Spelling:  thi-n-ish  Correct Spelling:  thi-nn-ish 
Find more wrongly spelled words of Thinnish to spell it well.