言不由衷的英文：
[Literal Meaning]
words/not/from/heart
What one says does not come from the heart.

[解释]
说的不是真心话。指内心和口头不一致。

[Explanation]
to say what one does not mean

[例子]
社会上很多人每天都要说一些言不由衷的话，带着伪善的面具。

[Example]
Many people in society today say what they do not mean everyday and wear hypocrite masks.

[英文等价词]
to speak with one's tongue in one's cheek
speak insincerely

meretricious praise
言不由衷的恭维

hypocritical;one's words belie his mind;insincere in one's words
言不由衷

Her words rang hollow,ie What she said sounded insincere.
她的话听起来很虚(言不由衷).

I mouthed some sympathetic platitudes.
我言不由衷地说了一些表示同情的客套话。

She wasn't entirely sincere when she said she liked me.
她说她喜欢我,这话有些言不由衷.

There has been a great deal of politician's cant.
说了一大堆政客惯用的言不由衷的话。