Many times, things are not what they look like from the outside. What are the two words describing such outside-look and inside-truth?
He looks casual, but he is a sincere person deep inside.
This is describing a person, about outside-look and inside-truth, I want that two contrasting words that summarize/lead the cases. I meant,
Skin deep, He appears casual, but deep within, he is sincere.
That Skin deep and deep within are the two contrasting words that I'm looking for. What are they? Especially when describing a matter, a situation etc.
superficially and actually? What else? What are the best phrases to replace the following contrasting words that summarize/lead the cases:
From outsider look, this programming language lacks such feature, but what's really true is that it has a much more powerful one.