adverb:in a simple manner; without complexity or difficulty
She explained the concept simply so everyone could understand.
adverb:merely; just; only
I'm not suggesting a complete overhaul, simply a few minor changes.
adverb:absolutely; really (used for emphasis)
The view from the top of the mountain was simply breathtaking.
adverb:in a straightforward or frank way
He told her simply that he could not agree to the terms.