If you describe something as ~, you mean that it is not needed or does not have to be done, and is undesirable.
The slaughter of whales is ~ and inhuman...
He accused Diana of making an ~ fuss.
= needless
? necessary
ADJ
unnecessarily
I didn’t want to upset my husband or my daughter unnecessarily...
A bad keyboard can make life unnecessarily difficult.
= needlessly
ADV: ADV with v, ADV adj