sullen is a valid English word

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

Meanings

Adjective (COMPARABLE)

Having a brooding ill temper; sulky.
Gloomy; dismal; foreboding.
• a sullen atmosphere
Sluggish; slow.

Noun (COUNTABLE)

(obsolete) One who is solitary, or lives alone; a hermit.
(in plural) Sullen feelings or manners; sulks; moroseness.

sullen is a Scrabble valid word

sullen

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

sullen is an iScramble, QuickWords valid word

sullen

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

Same letters words (Anagrams)

• UNSELL

Same letters plus one

• CULLENS
• DULLENS
• FULLENS
• LUNULES
• MULLENS
• MUNSELL
• NULLERS
• PULLENS
• SMULLEN
• SUELLEN
• SULLENS
• SUNDELL
• UNSELLS
• UNSHELL
• UNSPELL
• UNSWELL
• UNTELLS

Same letters minus one

• LULES
• LUNEL
• LUNES
• NULLS
• SLUNE
• SNELL
• SUELL
• SULEN