No longer effective, capable, or valuable

• kaput
• washed-up
• through
• done for
• done

Having no further relationship

• through
• done

Proficient as a result of practice and study

• practiced
• accomplished

Completed

• all over but the shooting
• wrapped-up
• wound-up
• sewed-up
• said-and-done
• brought to a close
• brought to a conclusion
• made an end of
• come-to-an-end
• at an end
• done with
• shut off
• turned-off
• attained
• all-over-with
• put-into-effect
• finalized
• realized
• broken-up
• no more
• gone
• used-up
• consumed
• disposed of
• satisfied
• discharged
• rounded-out
• polished
• worked-out
• made
• elaborated
• compassed
• settled
• resolved
• terminated
• lapsed
• stopped
• ceased
• brought-about
• effectuated
• effected
• consummated
• decided
• over
• closed
• fulfilled
• through
• complete
• dispatched
• executed
• performed
• concluded
• ended
• achieved
• perfected
• accomplished
• done

Given a finish

• surfaced
• japanned
• glazed
• enameled
• stained
• sized
• oiled
• waxed
• painted
• varnished
• shellacked
• lacquered
• buffed
• brushed
• dusted
• washed
• coated
• smoothed
• etched
• burnished
• beaten
• planed
• sanded
• rubbed
• polished

Ruined or dying

• done for
• doomed
• defeated