completely sealed (adjective) hermetic: airtight
Sinonime: accepted conduct,
amenities, breeding, civilities, correctness,
courtesy, decency, decorum,
delicacy,
dignity, etiquette, good behavior, good form,
modesty,
mores*, niceties, politeness, politesse, protocol, punctilio,
rectitude,
refinement, respectability, rules of conduct, seemliness, social conventions, social grace, the done thing
Antonime: bad manners, impropriety, misbehavior, misconduct