What is meant by romanticism?

Romanticism is a cultured movement focused on emotion and mystical feeling insted of reason and science to develop nationalist sentiment. They helped create a sence of collective heritage and cultural past as part of nation bilding through use of folk songs, dances & music.

Hope it helps!

Romanticism was characterized by its emphasis on emotion and individualism as well as glorification of all the past and nature, preferring the medieval rather than the classical. ... It also promoted the individual imagination as a critical authority allowed of freedom from classical notions of form in art.

i think the answer would mist likely be an adjective clause, because unhappy is an adjective.