「見た目は悪くないがちょっと軽薄そう」な外見とは裏腹に、彼女はいないし、女性に手が早いワケでもない。

tbd

In contrast to his "not bad looks but seems a bit of a dandy" appearance, he didn't have a girlfriend and he wasn't particularly fast with the ladies.

口と心は裏腹なことが多々ある。

tbd

What we say and what we mean are often quite different.

スウィート博士の性格はその名とは裏腹であった。

tbd

Dr. Sweet's nature belied his name.