professionell
professional
Refers to an activity that is done as a job and for pay, as opposed to a hobby.
Sie ist eine professionelle Tänzerin und tritt auf der ganzen Welt auf.
She is a professional dancer and performs all over the world.

professional
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professional
Refers to an activity that is done as a job and for pay, as opposed to a hobby.
Sie ist eine professionelle Tänzerin und tritt auf der ganzen Welt auf.
She is a professional dancer and performs all over the world.

'Professionell' (professional) belongs to the word family of 'der Profi' (the professional) and 'die Profession' (the profession/job). So it describes something that has to do with a profession or with high competence.
Er hat die Reparatur schnell und professionell erledigt.
He completed the repair quickly and professionally.
If 'professionell' (professional) refers to a person's status, the job-related meaning is intended. If it describes the quality of an action or result, it is about competence.
Er ist ein professioneller Fotograf.
He is a professional photographer.
The opposite is formed simply with the prefix 'un-': 'unprofessionell' (unprofessional). It describes behavior or work that does not meet the expected quality standards.
Es war unprofessionell, den Kunden so lange warten zu lassen.
It was unprofessional to keep the customer waiting so long.
To express high competence, 'professionell' (professional) is often combined with verbs such as 'arbeiten' (to work), 'handeln' (to act), or 'reagieren' (to react). Nouns such as 'Auftreten' (appearance/demeanor), 'Verhalten' (behavior), or 'Eindruck' (impression) are also typical.
Trotz des Stresses hat das Team sehr professionell gehandelt.
Despite the stress, the team acted very professionally.
professional / work-related
'beruflich' and 'professionell' can both have to do with work. 'beruflich' simply means: it belongs to one’s profession, work, or career. 'professionell' can also mean that someone does an activity as a job and for pay. In addition, 'professionell' often describes quality: someone works competently, objectively, and in a well-organized way. Learners easily confuse the words because both appear in work contexts. For the opposite of private, 'beruflich' fits. For good, expert work, 'professionell' fits.

Die Präsentation war sehr professionell und gut vorbereitet.
The presentation was very professional and well prepared.
Er ist beruflich oft in anderen Städten unterwegs.
He often travels to other cities for work.