Tantamount to无异于;相当于
Being Tantamount等价有偿
tantamount t与…相等的;同等的;等价
tantamount incommensurate等价
tantamount to immediate suspension等于立即中止
tantamount to torture相当于虐待
tantamount to implementatio等同于说明书
tantamount - incommensurate等量的
congruent tantamount commensurate一致的;同样的;相等的
ADJ（形容词） If you say that one thing is tantamount to another, more serious thing, you are emphasizing how bad, unacceptable, or unfortunate the first thing is by comparing it to the second thing. 无异于的 [正式][v-link ADJ 'to' n/-ing]
What Bracey is saying is tantamount to heresy.
布里斯正在说的无异于异端邪说。