From fiend + -ish.
fiendish (comparative more fiendish, superlative most fiendish)
- Sinister; evil; like a fiend.
- Synonym: conniving
- Very difficult.
- a fiendish crossword puzzle
sinister, evil
- Bulgarian: зъл (bg) (zǎl), демоничен (bg) (demoničen)
- Chinese: 惡魔似／恶魔似, 恶魔似
- Dutch: duivels (nl), sinister (nl)
- Esperanto: diabla (eo)
- Finnish: pirullinen (fi), paholaismainen
- French: diabolique (fr)
- Galician: diabólico (gl)
- German: teuflisch (de)
- Greek: μοχθηρός (el) (mochthirós)
- Hindi: भुतहा (bhuthā)
- Hungarian: ördögi (hu), pokoli (hu), ördöngös (hu)
- Italian: diabolico (it), demoniaco (it)
- Korean: 악마 (ko) (angma)
- Norwegian: djevelsk
- Plautdietsch: diewlisch
- Portuguese: sinistro (pt), diabólico (pt)
- Romanian: sinistru (ro), rău (ro), demonic (ro)
- Russian: дья́вольский (ru) (dʹjávolʹskij)
- Spanish: diabólico (es)
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