Does Immota's definition change when paired with Audacitas?You might try: Audacitas Immota.
Noted!The word audacitas (quite naturally our 'audacity') is to say 'boldness/courage', or even in the hyperbolic sense of 'foolhardiness/derring-do'.
And immotus (lit. 'unmoved') has in Latin the extended semantic value of 'unmovable/unshakable'.