Here is an interesting and rather commanding word that I found in The Greatest Adventures of Sherlock Holmes. Dr Watson was called in by Mrs Hudson to attend to “The Dying Detective”. Sherlock Holmes was on his deathbed. With great imperiousness, Holmes’ cries to Watson to stand back so that he does not catch the disease which is killing him. It was quite a thrilling story!

Imperious – domineering in a haughty manner; dictatorial; urgent; imperative

Usage: “Stand back! Stand right back!” said he with the sharp imperiousness which I had associated only with moments of crisis.