Adjective

(en adjective)

(of cloth) shabby, frayed and worn to an extent that warp threads show

* 2014, (Paul Salopek), Blessed. Cursed. Claimed. , National Geographic (December 2014)[http://ngm.nationalgeographic.com/2014/12/pilgrim-roads/salopek-text]

Unkempt, in threadbare clothes, with holed shoes and sun-cured hide, my costume is permanent: the traveler, the man from far away.

damaged or shabby

* Thomas Carlyle

Holy Virgin stood in the main Convent of Glatz, in rather a threadbare condition, when the Prussians first approached; the Jesuits, and ardently Orthodox of both sexes, flagitating Heaven and her with their prayers, that she would vouchsafe to keep the Prussians out.

(of a person) wearing clothes of threadbare material

(of speech) banal or ; trite or hackneyed

* {{quote-news

, year=2012 , date=August 21 , author=Jason Heller , title=The Darkness: Hot Cakes (Music Review) , work=The Onion AV Club citation , page= , passage=When the album succeeds, such as on the swaggering, Queen-esque “Nothing’s Gonna Stop Us,” it does so on The Darkness’ own terms—that is, as a random ’80s-cliché generator. But with so many tired, lazy callbacks to its own threadbare catalog (including “Love Is Not The Answer,” a watery echo of the epic “I Believe In A Thing Called Love” from 2003’s Permission To Land''), ''Hot Cakes marks the point where The Darkness has stopped cannibalizing the golden age of stadium rock and simply started cannibalizing itself. And, despite Hawkins’ inveterate crotch-grabbing, there was never that much meat there to begin with. }}

Adjective

(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .