1) Blasted 2) Cruel 3) Demonic 4) Diabolic 5) Diabolical 6) Diabolically cruel and wicked 7) Evil 8) Extremely evil or cruel 9) Hellish 10) Infernal 11) Satanic 12) Unholy 13) Very wicked 14) Wicked 1) Demoniacal 2) Demonic 3) Demonical 4) Devilish 5) Diabolic 6) Evil 7) Infernal 8) Satanic 
Fiendish is the first album (previous album Friction isn`t considered official by the band) released by composer Phideaux Xavier. In 2002, Phideaux began to work with Gabriel Moffat, on a series of new demos. He got back together with drummer Rich Hutchins and recorded songs for what would become the album Fiendish. The finished work was describe....
• (a.) Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish.
Fiend'ish adjective Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish. -- 
diabolically cruel and wicked.