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Webster 1913 Edition

Adj.

Deceitful; cunning; sly.

[Scot.]

loopie ‎(comparative more loopie, superlative most loopie)

(Scotland) deceitful; cunning; sly
- 1825, Archibald Crawfurd, Tales of my grandmother
  The guidwife had repeatedly given Peter the hint to throw the shawl into the bed, as it would be there concealed till the husband was gone; but Peter, the loopie — for who ever saw a packman that was not loopie? — began to think that he might manage to carry off both shawl and buckles […]