businesslike
adjective
uk/ˈbɪznɪslaɪk/ usgetting things done in a quick and practical way:
The meetings were very businesslike.
She had a brisk and businesslike manner.
suitable for a place of business:
We work in a casual yet businesslike environment.
To design a simple, professional letterhead, pick an attractive, businesslike font and use it to center your name and address at the top.