TRANQUILLEST
Scrabble letter values: T1R1A1N1Q10U1I1L1L1E1S1T1 = 21
Definition
TRANQUILLEST is the superlative of TRANQUIL.
adjective TRANQUIL: (of a body of water) free from disturbance by heavy waves.
Synonyms of TRANQUIL: placid, quiet, still, smooth, unruffled