seriousness

silicious

simious

socioreligious

spacious

spaciously

spaciousness

specious

speciously

speciousness

spurious

spuriously

spuriousness

struthious

studious

studiously

studiousness

subconscious

subconsciously

subreptitious

subreptitiously

superambitious

supercautious

supercilious

superciliously

superluxurious

superstitious

superstitiously

suppositious

supposititious

surreptitious

surreptitiously

suspicious

suspiciously

suspiciousness

symphonious

symphoniously

tedious

tediously

tediousness

temerarious

temerariously

temerariousness

tenacious

tenaciously

tenaciousness

tendencious

tendentious

tendentiously

tendentiousness