Big Huge Thesaurus

serious

adjective

• dangerous
• grave
• grievous
• severe
• life-threatening
• good
• unplayful
• sober

antonyms

• frivolous
• playful

similar terms

• grave
• sober
• critical
• difficult
• earnest
• hard
• important
• intellectual
• of import
• overserious
• real
• sedate
• serious-minded
• sincere
• sobering
• solemn
• solid
• thoughtful

sounds kind of like

• saccharase
• saccharose
• sack race
• sage grouse
• saragossa
• sarawak
• sargasso
• sargasso sea
• sars
• saurischia
• saurosuchus
• saururaceae
• saururus
• sawhorse
• sayers
• sazerac
• scarce
• scherzo
• scheuchzeriaceae
• scissors
• scissors kick
• sciurus
• scorch
• scores
• scorsese
• scourge
• scours
• scrag
• scraggy
• screak
• screaky
• screech
• screechy
• screw jack
• screw key
• scrooge
• sea horse
• sea wrack
• seagrass
• seahorse
• search
• secrecy
• seiurus
• serax
• serge
• sericeous
• series
• serosa
• serous
• sewage works
• sewer gas
• sewerage
• shag rug
• shakers
• shark
• shears
• shiraz
• shire horse
• shirk
• showy orchis
• shrewish
• shriek
• shrike
• shrug
• sikorsky
• siqueiros
• sirach
• siracusa
• sirc
• siriasis
• siris
• sirius
• sirocco
• skagerak
• skagerrak
• skew arch
• ski race
• ski rack
• skreak
• skreigh
• sorex
• sorgho
• sorgo
• sorus
• source
• sourish
• squarish
• squark
• squaw grass
• squirearchy
• sucrase
• sucrose
• sugar cookie
• surcease
• surge
• susurrous
• susurrus
• syracuse

rhymes with

• acrimonious
• aeneas
• alias
• amphibious
• antonius
• aquarius
• aqueous
• bilious
• celsius
• claudius
• coleus
• commodious
• contemporaneous
• copious
• courteous
• curious
• deleterious
• delirious
• demetrius
• devious
• dionysius
• dubious
• envious
• erroneous
• extraneous
• fastidious
• felonious
• furious
• gaseous
• glorious
• gregarious
• harmonious
• hideous
• hilarious
• homogeneous
• igneous
• ignominious
• illustrious
• imperious
• impervious
• industrious
• inglorious
• injurious
• insidious
• instantaneous
• invidious
• laborious
• lascivious
• lugubrious
• luxurious
• mauritius
• melodious
• meritorious
• miscellaneous
• mobius
• mysterious
• nefarious
• notorious
• nucleus
• oblivious
• obsequious
• obvious
• odious
• odysseus
• orpheus
• pancreas
• penurious
• percutaneous
• perseus
• precarious
• previous
• punctilious
• radius
• sanctimonious
• simultaneous
• spontaneous
• spurious
• stradivarius
• studious
• supercilious
• tedious
• unceremonious
• various
• vesuvius
• vicarious
• victorious
• vilnius
• vitreous