After many requests from our fellow visitors we have decided to list the 10 Longest Words in the English language according to the Oxford English Dictionary. We are 90% confident that you cannot spell any of the words found on this list. You are always more than welcome to share our articles with your friends and family!

10 Longest Words in the English Language

10. Incomprehensibilities (21 letters)

As the word itself says, incomprehensibility is impossible to comprehend. During the 90’s this word set the record as the longest word in everyday usage.

9. Dichlorodifluoromethane (23 letters)

If you love chemistry then you will love this word too. Its the chlorofluoromethane and its formula is CF2CI2

8. Thyroparathyroidectomized (25 letters)

This is a medical term that defines the excision of both the parathyroid and thyroid glands. Try pronouncing this word and let us know in the comments.

7. Honorificabilitudinitatibus (27 letters)

This word is actually the longest word found in any of the Shakespeare’s works. Another interesting fact about this word is that its the longest word featuring alternating consonants and vowels.

6. Antidisestablishmentarianism (28 letters)

This term refers to a political movement during the 19th century in Great Britain which sought to separate the church and the state.

5. Floccinaucinihilipilification (29 letters)

This is one of the longest words that many dictionaries such as Merriam-Webster do not recognize. Floccinaucinihilipilification is the act of describing something as unimportant or being worthless.

4. Pseudopseudohypoparathyroidism (30 letters)

A relatively mild form of pseudohypoparathyroidism that is characterized by normal levels of calcium and phosphorus in the blood.

3. Supercalifragilisticexpialidocious (34 letters)

If you are a Mary Poppins fan then you should definitely know this. Supercalifragilisticexpialidocious is the right word to say when there is nothing to say.

2. Hippopotomonstrosesquippedaliophobia (36 letters)

Oh the irony on this word. It is one of the longest words in the dictionary and the meaning is fear of long words. Crazy right?

1. Pneumonoultramicroscopicsilicovolcanoconiosis (45 letters)

And the winner unfortunately is a lung disease. This word was coined by the president of the NPL (National Puzzlers League) as a synonym for silicosis.

BONUS WORD: Technically the longest word in the world is a 189,819 lettered word for “titin” For obvious reasons we cannot post the whole word however here is the sample of what it looks like:

Methionylthreonylthreonylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleuc yllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolylphenylalanylvalylthreonylleucylgl ycylaspartylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleu cylglutamylalanylglycylalanylaspartylalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylseryla spartylprolylleucylalanylaspartylglycylprolylthreonylisoleucylglutaminylasparaginylalanylthreonylleucyl arginylalanylphenylalanylalanylalanylglycylvalylthreonylprolylalanylglutaminylcysteinylphenylalanylglu tamylmethionylleucylalanylleucylisoleucylarginylglutaminyllysylhistidylprolylthreonylisoleucylprolylisol eucylglycylleucylleucylmethionyltyrosyl