diabolically       
adverb  informal uk/ˌdaɪ.əˈbɒl.ɪ.kəl.i/ us/ˌdaɪ.əˈbɑː.lɪ.kəl.i/
 极度地
in an extremely bad or shocking way
  diabolically clever/wicked 极度聪明/邪恶 
 This charge is diabolically unfair. 这种指控极度不公平。 
 See: diabolical
 - More examples
 - It was a diabolically difficult decision to make.
 - For an Opposition party at mid-term to lose one of its own seats is diabolically bad.
 - He was perhaps the most diabolically clever killer in L. A. history.