staid
How to pronounce staid:
Synonyms for staid:
businesslike
calm
composed
decorous
demure
distinguished
earnest
grave
harsh
humorless
no-nonsense
po-faced
professional
quiet
sedate
self-restrained
serious
set in your ways
severe
sober
sobersided
solemn
steady
stern
strict
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Here are some other common 1-syllable words.