1. unceremonious, unceremonial -- (without ceremony or formality; "an unceremonious speech")
2. unceremonious -- (without due formalities; "unceremonious dismissal from office")
1.
There was an unceremonious directness, a searching, decided steadfastness in his gaze now, which told that intention, and not diffidence, had hitherto kept it averted from the stranger. - from Jane Eyre by Charlotte Bronte