unmailable
Rejected by post
Unmailable describes something that cannot be sent through the postal system, whether because it violates regulations or is physically unsuitable for mailing.
Hazardous materials, oversized packages, and certain restricted items are unmailable.
The clerk marked the package unmailable due to its contents.
The term appears most often in postal regulations and shipping contexts.
Officially disallowed
censored · contraband · embargoed · interdicted · outlawed · verboten · taboo · blacklisted
Likely to cause injury
- flammableProne to ignition
- perishableProne to decay
- corrosiveDestroys by chemical action
- explosiveProne to sudden detonation
radioactive · toxic · infectious · biological · chemical · fragile · batteries · liquids
Not brought to destination
- non-deliveryFailure to arrive
- unreachableCannot be accessed
- lostUnable to navigate
- misdirectedSent the wrong way
unclaimed · rejected · unaddressed · damaged · illegible · deceased · refused · vacant
Of mail service
- stampsPostal payment adhesives
- postmarkDated mailing imprint
- envelopesPaper containers for letters
- mailbagSack for letters
courier · letters · packages · parcels · postcard · franking · airmail · shipping
Adhering to requirements
- guidelinesSuggested rules for behavior
- rulesPrinciples governing behavior
- USPSAmerican postal agency
- customsTraditional practices or import taxes
declaration · inspection · packaging · labeling · restrictions · requirements · specifications · screening
banned
Officially disallowed
unlawful · censored · contraband · embargoed · interdicted · outlawed · verboten · taboo · blacklisted · unauthorized
hazardous
Likely to cause injury
- flammableProne to ignition
- perishableProne to decay
- corrosiveDestroys by chemical action
explosive · radioactive · toxic · infectious · biological · chemical · fragile · batteries · liquids · aerosols
undelivered
Not brought to destination
- non-deliveryFailure to arrive
- unreachableCannot be accessed
- lostUnable to navigate
misdirected · unclaimed · rejected · unaddressed · damaged · illegible · deceased · refused · vacant
postal
Of mail service
mailbag · courier · letters · packages · parcels · postcard · franking · airmail · shipping · sorting
compliance
Adhering to requirements
- guidelinesSuggested rules for behavior
- rulesPrinciples governing behavior
- USPSAmerican postal agency
customs · declaration · inspection · packaging · labeling · restrictions · requirements · specifications · screening · standards