busy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Engaged in activity, as work; occupied. synonym: active.
• adjective Characterized by or sustaining much activity.
• adjective Being a busybody; meddlesome; prying.
• adjective Being in use, as a telephone line.
• adjective Cluttered with detail to the point of being distracting.
• transitive verb To make busy; occupy.

from The Century Dictionary.

• To employ with constant attention; keep engaged; make or keep busy: as, to busy one's self with books.
• In decoration, full of detail; overcrowded; fussy.
• Actively or attentively engaged; closely occupied physically or mentally; intent upon that which one is doing; not at leisure: opposed to idle.
• Active in that which does not concern one; meddling with or prying into the affairs of others; officious; importunate.
• In constant or energetic action; rapidly moving or moved; diligently used: as, busy hands or thoughts.
• Pertaining or due to energetic action; manifesting constant or rapid movement.
• Requiring constant attention, as a task.
• Filled with, active duties or employment.
• Careful; anxious. Chaucer.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Engaged in some business; hard at work (either habitually or only for the time being); occupied with serious affairs; not idle nor at leisure.
• adjective Constantly at work; diligent; active.
• adjective Crowded with business or activities; -- said of places and times.
• adjective Officious; meddling; foolish active.
• adjective obsolete Careful; anxious.
• transitive verb To make or keep busy; to employ; to engage or keep engaged; to occupy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Doing a great deal; having a lot of things to do in the space of time given
• adjective Engaged in another activity or by someone else.
• adjective Having a lot going on; complicated or intricate.
• verb To make somebody busy, to keep busy with, to occupy, to make occupied.
• verb To rush somebody.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective intrusive in a meddling or offensive manner
• adjective crowded with or characterized by much activity
• adjective (of facilities such as telephones or lavatories) unavailable for use by anyone else or indicating unavailability; (`engaged' is a British term for a busy telephone line)
• adjective overcrowded or cluttered with detail
• verb keep busy with
• adjective actively or fully engaged or occupied