Difference between Amateurs and Unprofessional

AMATEURS vs UNPROFESSIONAL: NOUN

Not befitting a certain profession or a member of a profession; not in keeping with the rules of a certain profession: as, unprofessional conduct.
Not belonging to a profession: as, an unprofessional man.
Not pertaining to one's profession.

Watchers, Fans, Lovers, Drinkers, Collectors, Buffs, Connoisseurs, Aficionados, Enthusiasts, Unpaid, Unprofessional, Inexpert, Recreational, Unskilled, Nonprofessional

Unethical, Unbecoming, Discourteous, Disrespectful, Lay, Vocational, Occupational, Career, Nonprofessional, Untrained, Professional, Amateur, Unskilled, Inexpert, Amateurish

Journeymen, Pros, Golfers, Supporters, Fans, Drinkers, Collectors, Connoisseurs, Aficionados, Unpaid, Unprofessional, Inexpert, Recreational, Unskilled, Nonprofessional

Unethical, Unbecoming, Discourteous, Disrespectful, Lay, Vocational, Occupational, Career, Nonprofessional, Untrained, Professional, Amateur, Unskilled, Inexpert, Amateurish

All other players are considered to be amateurs.
Liberals attempt it, but are amateurs by comparison.
Too bad this is not written for amateurs.
He won the amateurs cup during that time.
THE AMATEURS SECURING MANY ICE AND SNOW SCENES.
Many amateurs are willing to assist other hams.
To make the great SAS look like amateurs.
NOTE: Male amateurs and juniors will play from the white tees; female amateurs and juniors will play from the red tees.
And because RPG theory holds only meager academic and societal status, most RPG theory and criticism is produced by critical amateurs for critical amateurs.
We like using excuses of being amateurs and if we continue to say that, we will remain as amateurs.

Haul as unprofessional, inconsistence, inconsiderate, disrespectful and belittling.
Good apartment amenities with a horrible unprofessional management.
Unprofessional behaviour was rampant and sales were poor.
Obviously, this kind of behavior is extremely unprofessional.
Very unprofessional communication and no customer service skills.
This carwash is small minded, rude and unprofessional.
The management is extremely rude, disrespectful, and unprofessional.
They have been nothing but unprofessional with me.
She states for unacceptable conduct and performance, sample letter of reprimand for unprofessional conduct pertaining to unprofessional will.
They categorize certain behaviours on social media into two categories: unprofessional and possibly unprofessional.