Here is a question one of my students asked me today.

What's the difference between 'definitely' and 'obviously'?

Wow, these are two very confusable words for English students!

Both are adverbs that are used to emphasize how we feel.

I want to see that movie. I definitely want to see it.
She is upset. She is obviously upset.

Dictionaries say that both 'definitely' and 'obviously' can mean 'clearly', but I think this is usually not true. Let's put the word 'clearly' into our examples.

I want to see that movie. I clearly want to see it.
She is upset. She is clearly upset.

Which sounds more natural? If you think it's this one:

She is upset. She is clearly upset

then I think you are right! 'obviously' is most similar to 'clearly' (I want to see that movie. I clearly want to see it sounds strange)

A good definition of 'obviously' is ' Easily perceived or understood; quite apparent.'
A good definition of 'definitely' is 'Certainly'. Without a doubt'

The word 'definitely' is used to express how sure we are about something.

I want to see that movie. I definitely want to see it. (I'm sure I want to see it)
I will definitely call you tonight. (without doubt)

Both 'definitely' and 'obviously' can be used in the same sentence, but the meaning changes.

-Are you going to come to my party?
-Yes, definitely (I'm sure I will)
-Yes, obviously (You clearly know that I will)

It's definitely true (I'm very certain)
It's obviously true (Everyone can see that it's true)


I HOPE THIS HELPS!