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(Note: E-CEN, E-FUN, E-JOH, E-IMP all list 'nipperty-tipperty', but with the following definitions. They all note it as being a Scottish word.
It is not listed in E-NED)
E-CEN, FUN, IMP - light-headed, silly, foolish; frivolous
E-JOH - nonsensical, absurd
From: Rob Roy
By Walter Scott, Volume I, 1821