junk
adjective
uk/dʒʌŋk/ us FINANCE, STOCK MARKET
relating to debt or investment in a company or organization that has a low credit rating (= ability to pay its debt):
Junk advocates point out that the average junk portfolio lost about 10% of its value in October, a vastly superior performance to equities.
junk level/rating/status The corporate bond market is heading for its worst year for credit quality after a wave of recent downgrades to junk status.
COMMUNICATIONS
relating to advertising in the form of mail, email, etc. that is sent without your asking for it:
Junk fax companies are constantly searching for new numbers to call in a process called war dialing.
junk email/mail/faxes