Difficult and complex logical thought processes, especially when performed effortlessly. / (derogatory) Inventive, complex arguments used to justify what is otherwise unjustifiable.

The tendency for groups of individuals to act together without planned direction.

(idiomatic, Philippines) A way of thinking best described by the phrase "if I can't have it, neither can you." The metaphor refers to a pot of crabs in which one tries to escape over the side, but is relentlessly pulled down by the others in the pot.

A hospital facility designed to treat persons with serious mental disorders, as opposed to disorders of the body.

(slang) Engaging in intellectually stimulating conversation with little or no practical purpose. / (slang) Thought processes that only serve to satisfy oneself.

plural of mental hospital

plural of mental gymnast

Someone who excels at mental gymnastics; a person who thinks creatively and effortlessly. / (derogatory) One who uses complex arguments to justify what is otherwise unjustifiable.

plural of mental reservation

The act of holding back some word or clause which is necessary to convey fully the meaning really intended by the speaker, distinct from equivocation.