What is the correct spelling for HILARRIUOS?

If you're inclined to spell "hilarriuos" instead of "hilarious", here are some helpful suggestions. Firstly, ensure you use just one "r" and one "l". Secondly, memorize the placement of vowels and consonants - it should be "h-i-l-a-r-i-o-u-s". Lastly, use spell-check or an online dictionary for verification.