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The tiredness unmet before.
The unprecedented tiredness .
用在前面的语句可以是It's the first time that…. 用在后面的语句可以是…which never see/happen before.
Such as never previously existed of heartbeat.
这前所未有的心动
绝对正确
前所未有来 [qiá源n suǒ wèi yǒu]
[词典百] unprecedented; hitherto unknown; such as never previously existed;
[例句]农村出度现了前问所未有的答繁荣。
A prosperity never seen before appeared in the countryside.