Etymology
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seriousness (n.)

1520s, from serious + -ness.

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Definitions of seriousness

seriousness (n.)
an earnest and sincere feeling;
Synonyms: earnestness / sincerity
seriousness (n.)
the quality of arousing fear or distress;
he learned the seriousness of his illness
Synonyms: distressfulness
seriousness (n.)
the trait of being serious; "a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice;
Synonyms: earnestness / serious-mindedness / sincerity
From wordnet.princeton.edu