Correct spelling, definition: the form controlled is the only correct spelling, because of a very important rule in English: if a word contains a single vowel before the last consonant, we must double that consonant. You can see that controlled matches this description. That’s why we write it with the double -ll instead of a single -l.
Definition of controlled:
the past participle, under the control of someone or something
I was controlled by my father all my life.
Susan felt controlled by her husband, but she didn’t know how to stop it.
Incorrect spelling, definition: although in English we most often create derivatives by adding a suffix to the unchanged word-formation base, sometimes we also have to double the last consonant of the root: when there is a single vowel before the last consonant in a word. This is the case with the word controlled. The form
controled is a common mistake.
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