tightly corked [bottle] / tightly stoppered [bottle]

seal hermetically / stopper [a bottle] tightly

consign a body to the grave privately / private burial / consign a body to the grave secretly / secret burial / bury a body privately / bury [a body] secretly

hold a funeral by the family members only / funeral hold by the family members only / hold a private funeral for

send *something secretly

complain about *something anonymously <to the police> / bring an action against *someone anonymously / sue *someone anonymously

wholly / surely / sufficiently / completely / absolutely / fully / perfectly

seal up / making a thing airtight / shut a thing tight / shut *something tightly / shutting a thing tightly / make *something airtight

be intimate / nearness / closeness

Laminaria angustata <scientific name>