Learner's definition of PERFECTLY
1 : in every way— used for emphasis
I was perfectly willing to help.
They are throwing out a perfectly good sofa.
It is perfectly normal/natural to feel nervous.
You know perfectly well what I mean. [=you know exactly what I mean]
To be perfectly honest, I don't want to go.
You are perfectly capable of doing it yourself.
The bridge is perfectly safe.
2 [more perfectly; most perfectly] : without errors, mistakes, or flaws: in a perfect way
She sang perfectly. [=she sang without making a mistake]
The dress fits perfectly. [=the dress is the right size]
The steak was perfectly cooked.
a perfectly formed rose