pernicious

Meanings

exceedingly harmful
working or spreading in a hidden and usually injurious way

Synonyms

baneful, deadly, insidious, pestilent, subtle

Scrabble Score: 14

pernicious is a valid Scrabble (US) TWL word
pernicious is a valid Scrabble Word in Merriam-Webster MW Dictionary
pernicious is a valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 18

pernicious is a valid Words With Friends word