Correct spelling, explanation: this form is the correct one as we add adverbial suffix -ly to the adjective true. e is skipped, perhaps due to pronunciation, but l is not doubled; there is no need to do so. Therefore truly is the correct spelling and
trully is a mistake.
Definition of truly:
adverb, in a way that something is truth
Jenny truly believe she will win the competition.
Jack is truly considered the best player in the team.
Incorrect spelling, explanation: we do not spell this adverb with double l, because we add the suffix to the word true which doesn’t end with another l. Vowel e is omitted but l is not doubled. Because of this truly is the correct spelling and
trully is not correct.
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