concern _noun

1-) feeling of worry

ADJECTIVES

considerable, deep, grave, great, major, serious
・The recent increase in pollution levels is of grave concern to environmentalists.

paramount, particular, special
・The lack of access to healthcare in rural areas is a matter of particular concern.

genuine, legitimate, real
・Consumers expressed legitimate concern about the safety of food products.

common, general, widespread • national, public 
・There is widespread concern among parents regarding the quality of education.

growing, increasing, mounting
・The growing concern about income inequality has sparked debates.

VERBS

feel
・I feel some concern for her safety.

express, show, voice, articulate
・The excessive use of social media by children has shown concern.

arouse, cause, give rise to, heighten, increase
・The recent increase in crime rates has caused concern among the local residents.

PREPOSITIONS

in
・In her concern for the elderly, she volunteered at a local nursing home.

out of
・Out of concern for his health, she urged him to quit smoking.

about/over
・The teacher addressed the student's concern about the upcoming exam.

for
・She has deep concern for her child. 

PHRASES 

be of (no) concern to sb
・The decision of the committee is of no concern to me. 

(a) cause for concern
・The decline in sales is a cause for concern for the company's profitability.

a lack of concern
・Their lack of concern for the environment is disheartening.

a matter of concern
・The rising inflation rate is a matter of concern for the government.

2-) something that worries you

ADJECTIVES

deep, grave, serious
・We still have some serious concerns regarding the project's budget.

chief, main, major, overriding, paramount, particular, primary, prime
・The main concern of the project team is to meet the deadline.

common • genuine, legitimate, real
・The doctor listened attentively to the patient's genuine concerns.

immediate, pressing, urgent
・Retirement savings are among the immediate concerns in my mind.

environmental, ethical, humanitarian
・The humanitarian concerns of the refugee crisis require immediate attention and support.

VERBS

air, articulate, echo, express, highlight, outline, raise, reiterate, voice
・The teacher encouraged students to voice their concerns. 

allay, alleviate, assuage
・They held a press conference to allay concerns about the recent outbreak. 

NOUNS

crime, health, privacy, safety, security
・The safety concerns prompted the recall of the defective product.

PHRASES 

be none of sb's concern
・My personal life is none of your concern.

3-) something that is important 

ADJECTIVES

main, major, overriding, paramount, primary, prime
・Her main concern is maintaining a healthy lifestyle.

concern _verb

1-) to affect or involve 

ADVERBS

directly
・The policy change directly concerns all employees in the organization.

PREPOSITIONS

in
・She is actively concerned in the promotion of the product.

2-) to worry

ADVERBS

a lot, really • slightly
・It really concerns me that the situation is getting worse.