fiendishly is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Adverb (COMPARABLE)

In a fiendish manner; evilly, wickedly.
Extremely, very in harsh or negative contexts.

fiendishly is a Scrabble valid word

fiendishly

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

fiendishly is an iScramble, QuickWords valid word

fiendishly

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• none

Same letters plus one

• FRIENDLYISH

Same letters minus one

• SHINFIELD