difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge; "the professor's lectures were so abstruse that students tended to avoid them"; "a deep metaphysical theory"; "some recondite problem in historiography"
characterized by care and perseverance in carrying out tasks; "a diligent detective investigates all clues"; "a diligent search of the files"
quietly and steadily persevering especially in detail or exactness; "a diligent (or patient) worker"; "with persevering (or patient) industry she revived the failing business"
a person engaged in one of the learned professions
an athlete who plays for pay
engaged in a profession or engaging in as a profession or means of livelihood; "the professional man or woman possesses distinctive qualifications"; "began her professional career after the Olympics"; "professional theater"; "professional football"; "a professional cook"; "professional actors and athletes"
characteristic of or befitting a profession or one engaged in a profession; "professional conduct"; "professional ethics"; "a thoroughly professional performance"
engaged in by members of a profession; "professional occupations include medicine and the law and teaching"
of or relating to a profession; "we need professional advice"; "professional training"; "professional equipment for his new office"
of or relating to or suitable as a profession; "professional organizations"; "a professional field such as law"
representing what is real; not abstract or ideal; "realistic portraiture"; "a realistic novel"; "in naturalistic colors"; "the school of naturalistic writers"