be stumped - to be unable to answer a question or solve a problem because it is too difficult, dumbfounded - so shocked that you cannot speak, heuristic - allowing students to learn by discovering things themselves and learning from their own experiences rather than by telling them things, crook - to bend your arm or finger; bad or ill, off-the-shelf - used to describe a product that is available immediately and does not need to be specially made to suit a particular purpose, negligible - too slight or small in amount to be of importance, endorse - support, agree, give permission,

Thinking, Fast and Slow (Chapter 9)

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