Question: what is the most difficult word in the english language?
Answer: Literally. If you know a language purist, watch out. ... 
Ironic. Here is a word that has confused almost all English speakers – native or otherwise. ... 
Irregardless (instead of regardless) You might have heard people use 'irregardless' when they mean to say 'regardless'. ... 
Whom. ... 
Colonel. ... 
Nonplussed. ... 
Disinterested. ... 
Enormity.