needlessly

From needless +‎ -ly.

needlessly (comparative more needlessly, superlative most needlessly)

In a needless manner.
To a degree or extent beyond what is needed.
He was always needlessly anxious about his dog.
- 1902, Herbert George Wells, Anticipations:
  At present that convenience is still needlessly expensive in Great Britain, and a scandalously stupid business conflict between telephone company and post-office delays, complicates, and makes costly and exasperating all trunk communications; but even under these disadvantages the thing is becoming a factor in the life of ordinary villadom.
Without need.
He worried needlessly about his dog.

in a needless manner

English