Translation of "audacia" into English

Ut crebro temporibus magno distinctis discrimine accidit, quae audacia requirunt consilia, arbitramur accidentia certa non esse.

As often occurs in periods of deep crisis which require bold decisions, we are tempted to think that what is happening is not entirely clear.

deinde intumescente motu profugus repertusque, postquam intutae latebrae, praesidium ab audacia mutuatur: non praefectum ab iis, sed Germanicum ducem, sed Tiberium imperatorem violari.

Then, when the commotion increased, he fled and having been discovered, as his hiding place was now unsafe, he borrowed a resource from audacity.