Answer: really

AnswerCrossword Clue
REALLYKinks: "You ... Got Me"
REALLYQuite
REALLY"Is that so?"
REALLY"Is that so!"
REALLY"Come on now!"
REALLY"For sure?"
REALLYRemark of exasperation
REALLYNo kidding, as to friend
REALLY"Are you kidding me?"
REALLY"Are you joking?"
REALLYIn truth
REALLY"Honest!"
REALLY"No kidding?"
REALLYDe facto
REALLY"Oh?"
reallyactually
reallygenuinely; truly
reallyindeed
reallyactually (really)
REALLYWithout question
REALLYIn fact
REALLY"Indeed!"
REALLYIndeed
REALLY"No doubt about it!"
REALLY"Is that right?"
REALLY"No kidding!"
REALLY"No fooling?"
REALLYIndeed!
REALLY"No kidding"
REALLY"Do you mean that?"
REALLYAt heart
REALLY"I mean it!"
REALLYIn actuality
REALLY"It's true!"
REALLYHonest Injun?
REALLYQuery of the incredulous.
REALLYTruly.
REALLYYou mean it?