Abstruse: difficult to understand; obscure.
Benevolent: displaying kindness or goodwill.
Conundrum: a puzzling question or problem.
Desuetude: the state of being disused or out of fashion.
Ephemeral: lasting for a very short time.
Fastidious: extremely attentive to detail or order.
Gargantuan: enormous or gigantic in size or scale.
Imbroglio: a complicated or confusing situation.
Lachrymose: characterized by or accompanied by tears.
Magnanimous: generous or forgiving, especially towards a rival or someone less powerful.
Obdurate: stubbornly refusing to change one's opinion or course of action.
Paucity: a small number or amount of something.
Quixotic: impractical or idealistic, especially in the pursuit of some unattainable goal.
Recalcitrant: stubbornly resistant to authority or control.
Sanguine: optimistic or cheerful.
Ubiquitous: present everywhere or in many places at the same time.
Vapid: lacking flavor, interest, or vitality.
Zealous: full of zeal; ardent or passionate.