The second place went to 'sacrilegious', where people often get confused over whether it has an 'E' or 'I' in the middle.
Indict', which is often misspelt as 'indite', came third followed by= 'manoeuvre' at the fourth place
Britons often face problems due to the proximity of the 'O' and 'E' to each other.
'Bureaucracy' was fifth, which is awkward because the inclusion of so many vowels.
'Broccoli', 'phlegm', 'prejudice', 'consensus' and 'unnecessary' wrapped up the top ten.
The survey led by www.OnePoll.com showed that nearly one in 10 thought 'mortgage' was spelt 'morgauge' and seven per cent often spell 'speech' as 'speach'.
Moreover, 90 per cent couldn't spell 'diarrhoea'.
"So many of us can't seem to spell," the Telegraph quoted a spokesperson for market research company www.OnePoll.com as saying.
"Whether it is down to the structure of the word, or the frequency of use, there is no excuse not to learn how they are formed.
"And considering people judge others, yet don't like their intelligence to be judged by how well they spell, they should up their game and pick up a dictionary," the spokesperson added.
Top 10 misspelt words are: