神经 shénjīng nerve
nerve; mental state; (colloquial) unhinged; nutjob
How to remember 神经: 神 god + 经 go through = nerve.
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How it is used
- Nerve(s) in the body - 神经系统 (shénjīng xìtǒng) the nervous system.
- Colloquially also 'crazy/unhinged' - 你神经啊? (nǐ shénjīng a?) are you nuts?, 神经病 (shénjīngbìng) as an insult for 'crazy'.
- Medical in the literal sense; the slang sense is casual and rude.