Definitions:

1. in a manner at variance with what is natural or normal adverb
   • The early Church not unnaturally adopted the position that failure to see the messianic character of their work was really caused by the people's own blindness.
2. in an unnatural way adverb
   • Their other arm lay across their chest, unnaturally, holding an awkward pose.

Synonyms:

• artificially
• by artificial means