apostate

她曾是坚定的共产主义者，但后来背弃信仰并公开批评该意识形态。

She was a staunch communist but later became an ___apostate and openly criticized the ideology.

在虔诚多年之后，他成了背弃者，彻底放弃了那个宗教派别。

After years of devotion, he became an ___apostate and renounced the religious sect entirely.

那位知名生物学家因挑战该领域最权威的理论而被贴上背弃者的标签。

The renowned biologist was branded an ___apostate for challenging the field's most established theory.