unnaturally in WordNet English dictionary

1. not according to nature; not by natural means
   "artificially induced conditions"
   artificially  unnaturally  by artificial means  artificially  unnaturally  by artificial means 
   
2. in an unnatural way
   "his other arm lay across his chest, unnaturally, as if placed there deliberately, for a purpose"
   unnaturally  unnaturally 
   
3. in a manner at variance with what is natural or normal
   "The early Church not unnaturally adopted the position that failure to see the messianic character of his work was really caused by the people's own blindness"
   unnaturally  unnaturally 
   

unnaturally in English Wiktionary