"busiest" in the adjective sense
1. busy
actively or fully engaged or occupied
"busy with her work"
"a busy man"
"too busy to eat lunch"
2. busy, fussy
overcrowded or cluttered with detail
"a busy painting"
"a fussy design"
3. interfering, meddlesome, meddling, officious, busy, busybodied
intrusive in a meddling or offensive manner
"an interfering old woman"
"bustling about self-importantly making an officious nuisance of himself"
"busy about other people's business"
4. busy
crowded with or characterized by much activity
"a very busy week"
"a busy life"
"a busy street"
"a busy seaport"
5. busy, engaged, in use
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
"her line is busy"
"receptionists' telephones are always engaged"
"the lavatory is in use"
"kept getting a busy signal"
Source: WordNet® (An amazing lexical database of English)
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