hermetical Synonyms

zip-locked watertight enclosing airtight unseen unknown underground tight secluded sealed air-proof airproof pressure-tight air-locked vacuum-packed undisclosed sealing sealable enclosed dampproof airtightness seal private covert confinement concealed clouded closed chemical chemic alchemical air-tight cryptic dark obscure mysterious latent invisible hidden hermetic esoteric eclipsed detention abstruse