un·nec·es·sar·i·ly /ˌʌnˌnɛsəˈsɛrəli/
(ad.)不必要地
Un·nec·es·sa·ry a. Not necessary; not required under the circumstances; unless; needless; as, unnecessary labor, care, or rigor. -- Un*nec*es*sa*ri*ly adv. -- Un*nec*es*sa*ri*ness, n.
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unnecessarily
adv 1: in an unnecessary manner; "they were unnecessarily rude"
[ant: necessarily]
2: without any necessity; "this marathon would exhaust him
unnecessarily"