WORRIED›worried: [+ that]I am very concerned that class sizes seem to be growing.People are becoming more concerned about what they eat. → Oppositeunconcerned
AFFECTED[never before noun]›involved in something or affected by it: A letter will be sent out to everyone concerned.
as far as sb is concerned›used to show what someone thinks about something: As far as our customers are concerned, price is the main consideration.
as far as sth is concerned›used to tell someone what you are talking about: As far as college is concerned, everything is fine.