getting the attributes of a fiend; characteristic of a fiend; demoniacal; extremely sinful, cruel, or destructive; devilish: as, a fiendish persecutor; fiendish laughter.
obtaining the qualities of a fiend; attribute of a fiend; demoniacal; acutely wicked, harsh, or destructive; devilish: because, a fiendish persecutor; fiendish laughter.
obtaining the qualities of a fiend; attribute of a fiend; demoniacal; incredibly wicked, harsh, or harmful; devilish: because, a fiendish persecutor; fiendish laughter.
obtaining the attributes of a fiend; characteristic of a fiend; demoniacal; exceedingly wicked, harsh, or destructive; devilish: since, a fiendish persecutor; fiendish laughter.
getting the characteristics of a fiend; feature of a fiend; demoniacal; excessively sinful, cruel, or malicious; devilish: as, a fiendish persecutor; fiendish laughter.
How would you define fiendish?