unnaturally

/ʌnˈnætʃərəli/
adverb
  1. In a way that is not normal, natural, or expected.
    • The sky was unnaturally dark for noon.
    • He smiled unnaturally, as if forcing himself to be cheerful.
    • The plant grew unnaturally fast after the chemical spill.
  2. To an extreme or excessive degree; unusually.
    • The water in the pool felt unnaturally warm.
    • His voice was unnaturally calm given the chaos around him.
    • She was unnaturally quiet during the entire meeting.
Antonyms
What does "unnaturally" mean? | whatsthatwordmean | whatsthatwordmean