spack
/spak/adjective
Of a person: quick, prompt, ready; intelligent, clever. In later use archaic and English regional.
Origin
Middle English; earliest use found in Trinity Cambridge Manuscript. From early Scandinavian (compare Old Icelandic spakr wise, quiet, gentle, Old Swedish spaker wise, quiet, gentle, peaceful (Swedish spak), Old Danish spak, spag quiet, gentle (Danish spag)), perhaps from the same Indo-European base as Croatian paziti to give heed to.