Noun
(uncountable, derogatory) Assertions that have the appearance, but not the actuality, of scientific support.
His testimony was worse than science fiction: it was junk science.
(countable, derogatory) A cluster of assertions, publications, and experts that have the appearance, but not the actuality, of a scientific specialty.
Source: en.wiktionary.orgThe national security state has many unfair and cruel weapons in its arsenal, but that of junk science is one which can be fought and perhaps defeated. Aldrich Ames