Quick Quiz: Nouns Score: Change category, Flip order Reset Correct! Noun: adamant Your choice? yucca with long stiff leaves having filamentlike appendages very hard native crystalline carbon valued as a gem a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin South African shrub having a swollen succulent stem and bearing showy pink and white flowers after the leaves fall; popular as an ornamental in tropics