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pernicious
adjective
See more 4-syllable adjectives

How to pronounce pernicious:

Definition of pernicious:

pernicious (adjective):
exceedingly harmful.
highly injurious or destructive deadly

Synonyms for pernicious:

adverse
bad
baleful
baneful
damaging
dangerous
deadly
deleterious
destructive
detrimental
evil
fatal
harmful
hazardous
hostile
hurtful
ill
infectious
injurious
maleficent
malevolent
malicious
malign
malignant
mischievous
Show 11 more

Antonyms for pernicious:

anodyne
benign
bland
friendly
gentle
guiltless
harmless
hurtless
innocent
innocuous
innoxious
inoffensive
low-risk
meaningless
mild
non-dangerous
non-irritant
non-poisonous
non-toxic
noncorrosive
nondestructive
nonfatal
nonhazardous
noninfectious
nonirritating
Show 25 more
Other 4-syllable words

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The longest English word without repeated letters, 'uncopyrightable', has seven syllables.

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