This is the 4614th most frequent Russian word.
деловой
Businesslike; professional; pertaining to work or business.
The word 'деловой' describes the type of attire suitable for professional or business environments.
В деловом костюме он выглядел очень солидно.
In a business suit, he looked very respectable.
The word 'деловой' refers to the practical and goal-oriented method of acting or decision-making.
Деловой подход в решении задачи принес отличный результат.
A business-like approach to solving the problem yielded an excellent result.
Here, 'деловой' is used to describe advice that is pragmatic and useful for professional or serious contexts.