Meaning : (used for emphasis) absolutely.
Example :
I just can't take it anymore.
He was just grand as Romeo.
It's simply beautiful!.
Synonyms : just
Meaning : Absolutely. Altogether. Really.
Example :
We are simply broke.
Meaning : In a simple manner. Without extravagance or embellishment.
Example :
She was dressed plainly.
They lived very simply.
Synonyms : plainly