ARCH (4)

Arch (ärch), a. [[See Arch-, pref.]] 1. 1. Chief; eminent; greatest; principal.
The most arch act of piteous massacre. Shak. 2. 2. Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad.
spoke his request with so arch a leer. Tatler.