neurasthenia

n [U] (medical 医) weak condition of the nerves, causing tiredness, worry, dizziness, etc 神经衰弱.

nervousness, nervy, nest, nest-egg, nesting home, nestle, nestling, net, net (also nett), netball, nether, nethermost, netting, nettle, nettle-rash, network, neur(o)-, neural, neuralgia, neuralgic, neurasthenic, neuritis, neurological, neurologist, neurology, neuron, neurosis, neurotic, neurotically, neurotoxic, neuter, neutral, neutrality, neutralization, neutralization, neutralisation, neutralize, neutralize, neutralise, neutrally, neutron, neutron bomb,