As a noun xenophobia

is a fear of strangers or foreigners.

As an adjective undefined is

lacking a definition or value.

As a noun internment

is confinement within narrow limits, as of foreign troops, to the interior of a country.

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between shameless and undefined

is that shameless is having no shame, no guilt nor remorse over something wrong; immodest; unable to feel disgrace while undefined is lacking a definition or value.

As a noun respondee

is one who is responded to.

As an adjective undefined is

lacking a definition or value.

As a verb rejoice

is to be very happy, be delighted, exult; to feel joy.

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between arguable and undefined

is that arguable is that which can be argued; ie, that which can be proven or strongly supported with sound logical deduction, precedent, and evidence while undefined is lacking a definition or value.

As adjectives the difference between tough and undefined

is that tough is strong and resilient; sturdy while undefined is lacking a definition or value.

As an interjection tough

is (slang) (used to indicate lack of sympathy).

As a noun tough

is a person who obtains things by force; a thug or bully.

As a verb tough

is to endure.

As adjectives the difference between polyvinyl and undefined

is that polyvinyl is (chemistry) designating any polymer derived from a vinyl compound while undefined is lacking a definition or value.

As a verb enclude

is .

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between uncomfortable and undefined

is that uncomfortable is not comfortable while undefined is lacking a definition or value.