Merriam-Webster's Collegiate® Dictionary, 11th Edition
BUSY
I. adjective (busier; -est)
Etymology: Middle English bisy, from Old English bisig; akin to Middle Dutch & Middle Low German besich busy Date: before 12th century
1. engaged in action ; occupied, being in use , full of activity ; bustling , foolishly or intrusively active ; meddling, full of distracting detail , busily adverb busyness noun Synonyms: see: busy
II. verb (busied; busying) Date: before 12th century transitive verb to make busy ; occupy , intransitive verb bustle