Unseelie adjective 1noun 1forms 4 adjective1 •Of or pertaining to the unseelie; malevolent (as a fairy, etc).“I am very Unseelie Tuatha Dé. Almost one hundred percent, in fact. Only a drop of Seelie to muddy the pool. Do you have a problem with that, Shining One?” — 2010 noun1 •A malevolent or malicious fairy. formsmore Unseelie · more unseelie · most Unseelie · most unseelie