n. Derived from the sexiest literary man ever--Mr. Fitzwilliam Darcy, the epitome of brooding manliness and the male protagonist of Jane Austen's novel Pride and Prejudice--someone (typically male) who exhibits Mr. Darcy-like qualities (i.e. hotness, taciturnity, excellent penmanship, etc.).
adj. Displaying such Mr. Darcy-like characteristics.
n. What a dreamboat! That guy is SUCH a darcy!
adj. That man is so darcy. Just look at him, standing there, brooding and looking generally displeased with everything. I'd tap that.