What is the most difficult word to pronounce in English language?

There's no single "most difficult" word, as pronunciation difficulty depends heavily on a person's native language, dialect, and individual speech patterns. However, some words commonly cited as challenging include:

Words with tricky sounds:

* "Squirrel": The "squ" sound can be tricky for non-native speakers.

* "Worcestershire": The multiple "s" sounds and the "ce" at the end can be challenging.

* "Pneumonoultramicroscopicsilicovolcanoconiosis": This incredibly long word is often cited as the hardest, but it's more about length and complexity rather than individual sounds.

* "Rhythm": The silent "h" and the vowel sound can be tricky.

Words with unfamiliar sounds:

* "Colonel": The "o" sound is pronounced differently than in other words.

* "Adieu": The French pronunciation of "ieu" can be challenging.

* "Tsunami": The "tsu" sound is not common in English.

Words with complex spelling:

* "Supercalifragilisticexpialidocious": This word is made up of a lot of syllables and sounds that don't follow common spelling rules.

* "Ephemeral": The "ph" sounds like an "f".

Ultimately, the "most difficult" word is subjective and depends on the individual. Even native speakers might struggle with certain words they haven't encountered frequently.