imperiousness

n [U].

impenetrable, impenetrably, impenitence, impenitent, impenitently, imperative, imperatively, imperceptible, imperceptibly, imperfect, imperfection, imperfectly, imperial, imperialism, imperialist, imperialistic, imperially, imperil, imperious, imperiously, imperishable, impermanence, impermanent, impermeability, impermeable, impermissible, impersonal, impersonality, impersonally, impersonate, impersonation, impersonator, impertinence, impertinent, impertinently, imperturbability, imperturbable, imperturbably, impervious, imperviousness,