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brain-damaged: adj.

1. [common; generalization of “Honeywell Brain Damage” (HBD), a theoretical disease invented to explain certain utter cretinisms in Honeywell Multics] adj. Obviously wrong; cretinous; demented. There is an implication that the person responsible must have suffered brain damage, because he should have known better. Calling something brain-damaged is really bad; it also implies it is unusable, and that its failure to work is due to poor design rather than some accident. “Only six monocase characters per file name? Now that's brain-damaged!

2. [esp. in the Mac world] May refer to free demonstration software that has been deliberately crippled in some way so as not to compete with the product it is intended to sell. Syn. crippleware.