The trick: spell definite, then add -ly
The correct spelling is definitely: D-E-F-I-N-I-T-E-L-Y. The best memory trick is simple and honest: the word contains definite, then adds -ly. That kills the two most common mistakes: sneaking in an A, or dropping the second I.
Mnemonic
Definite + ly = definitely. If you can spell definite, you're already almost done.
Say it like a build instruction: spell definite first, then snap on -ly. Clean, memorable, hard to mess up.
Visual breakdown
DEFINITELY
Two I's. No A. The ending is just -ly, not an extra vowel adventure.
The rule
Definitely is an adverb built from definite + -ly. English keeps the base word spelling, which is why the second I stays put.
Common mistakes
The classic wrong version. That A does not belong there.
Dropped the second I, which breaks the word definite.
Wrong vowel swap. The middle stays ...finite....
Wrong middle vowel and a rushed ending. A double miss.
Practice it in real sentences
Mini exercise: spot the right one
Fill in the blank
I will definitely remember this one because I spell definite first, then add -ly.
Related words that make this easier
More SpellCamp guides
If tricky middle vowels or hidden letter patterns keep biting, these are worth a look too: how to spell separate, how to spell unnecessary, and the i before e rule.
Practice Spelling "Definitely" Right Now
Reading the trick helps. Actually practicing the word is what makes it stick. SpellCamp drops you straight into the word with audio, feedback, and spaced repetition.
FAQ
What is the correct spelling of definitely?
It is definitely, spelled D-E-F-I-N-I-T-E-L-Y. The cleanest memory trick is to spot definite inside it and then add -ly.
Why is definitely hard to spell?
Because people often hear an A sound and write definately, or they rush and drop the second I. English is rude like that.
What's a trick to remember how to spell definitely?
Use definite + ly = definitely. It is simple, visual, and actually true, which makes it much easier to remember than a fake mnemonic.