RichThesaurus
uneffervescent
vs
unruffled
uneffervescent
adj
Not effervescent.
unruffled
adj
Not ruffled or tousled.
Calm, not ruffled, serene, at peace, unbothered.
How often have the words
uneffervescent
and
unruffled
occurred in a corpus of books?
(source:
Google Ngram Viewer
)