sericeous ( synonym found)
Definition of sericeous:

(adj) : without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn; important; weighty; not trifling; leaving no room for play; needing great attention
"it was a surprise to see the captain, who had always seemed so serious, laugh so heartily."
Definition of sericeous:

(adj) : without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn; important; weighty; not trifling; leaving no room for play; needing great attention
"it was a surprise to see the captain, who had always seemed so serious, laugh so heartily."
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