Synonyms of the word

stumper

• n. One who stumps, or speaks, or orates, as a politician.
• n. (informal) A difficult puzzle or problem.
• n. (archaic, slang) A boastful person.

poser

• n. (Britain) A particularly difficult question or puzzle.
• n. Someone who, or something which, poses; a person who sets their body in a fixed position, such as for…
• n. (pejorative, slang) A poseur; someone who affects some behaviour, style, attitude or other condition,…

problem

• n. A difficulty that has to be resolved or dealt with.
• n. A question to be answered, schoolwork exercise.
• n. A puzzling circumstance.
• adj. (of a person or an animal) Difficult to train or guide; unruly.
• adj. Causing a problem; problematic; troublesome.

sticker

• n. something that sticks.
• n. an adhesive label or decal.
• n. a brand, label, or company, especially one making and distributing records.
• n. a price tag.
• n. the listed price (also sticker price).
• n. (informal) a burr or seed pod that catches in fur or clothing.
• n. a wooden strip placed between courses of lumber to allow air circulation. (also 'kiln sticker').
• n. (colloquial, dated) That which causes one to stick; that which puzzles or poses.
• n. (music) A small wooden rod in an organ which connects (in part) a key and a pallet, so as to communicate…
• n. (US, politics) A paster.
• n. (Internet) A picture that is a detailed illustration of a character that represents an emotion or action…
• v. To apply one or more stickers to (something).
• v. To mark as the sticker price.
• adj. (nonstandard, informal) comparative form of stick: more stick (stickier).

toughie

• n. (informal) Something that is tough, or difficult.