Misspelt means that a word is spelled wrong.
Misspelt can make people think of mistakes or not being careful.
Examples:
The word 'cat' is misspelt as 'kat'.
She misspelt her name on the test.
He has a misspelt word in his letter.
The sign is misspelt, so it says the wrong thing.
The misspelt word made everyone laugh.
I saw a misspelt word on the big sign.