Used attributively to qualify a noun with the sense ‘deceptive; bogus’.
Definitions
Deceptive, false, or insincere; bogus (used attributively). The board dismissed the plan as a humbug proposal designed to win votes.
Exclamation expressing that something is nonsense or rubbish.
Definitions
Used to express disbelief, contempt, or dismissal of something regarded as nonsense. "Humbug!" cried Scrooge, unimpressed by the carolers.