Jimpy

[…]though more than a hundred folk sitting in his company had beheld him dauting her with his arm round her jimpy waist, not five minutes before.

Source: wiktionary

When cerebellar tissues from normal and Jimpy are grown on the same slide in a common medium, no mutual effects can be observed: the Jimpy does not myelinate, and the normal does not stop myelination.

Source: wiktionary

1999, Klaus-Armin Nave, Chapter 2: X-Linked Dysmyelination: Mouse Models of Pelizaeus-Merzbacher Disease, Brian Popko (editor), Mouse Models in the Study of Genetic Neurological Disorders, Kluwer Academic / Plenum Publishers, page 29, The jimpy phenotype is marked by a CNS-specific dysmyelination and has provided an authentic animal model for PMD (Sidman et al., 1964). Typically, 50% of the male progeny of jimpy carrier females are affected, whereas the heterozygous carrier female itself is unaffected.

Source: wiktionary

1985 [Hodder and Stoughton], Terence Strong, Conflict of Lions, 2014, Silver Fox Press, unnumbered page, Before they had come to a standstill, the protective cover had come off the powerful twin GPMG ‘jimpies’ mounted in the rear compartment by the laconic Australian, Corporal Kangers Webster.

Source: wiktionary