how do you spell definitely

You had a keyboard in your hands and still asked someone.

It's spelled definitely: D-E-F-I-N-I-T-E-L-Y.

One trick makes it stick. It comes from the word finite, so it's de + finite + ly. No "a" anywhere.

Common misspellings to avoid:

• definately (the most common one)
• definitly
• defiantly (a real word, but it means "rebelliously", so it's a different word)

That took less effort than typing the question.