mismisspell

To spell a word wrong wrong;
to spell a word wrongly wrongly;
to spell a word incorrectly incorrectly;
to fail to spell a word wrongly;
to fail to spell a word incorrectly;
to fail to fail to spell a word correctly;
to spell in a wrong wrong way;
to spell in an incorrect incorrect way;
to write or utter with wrong wrong letters;
to write or utter with incorrect incorrect letters;

A mismisspelling of "ethylenediaminetetraacetates" would be "ethylenediaminetetraacetates."