Akademik

seriousness
noun
1. an earnest and sincere feeling (Freq. 2)
Syn: ↑earnestness, ↑sincerity
Derivationally related forms: ↑sincere (for: ↑sincerity), ↑earnest (for: ↑earnestness)
Hypernyms: ↑gravity, ↑solemnity
2. the quality of arousing fear or distress (Freq. 1)
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he learned the seriousness of his illness

Syn: ↑distressfulness
Derivationally related forms: ↑distressful (for: ↑distressfulness), ↑serious
Hypernyms: ↑badness, ↑severity, ↑severeness
3. the trait of being serious
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"a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice

Syn: ↑earnestness, ↑serious-mindedness, ↑sincerity
Ant: ↑frivolity
Derivationally related forms: ↑sincere (for: ↑sincerity), ↑serious-minded (for: ↑serious-mindedness), ↑earnest (for: ↑earnestness), ↑serious
Hypernyms: ↑trait
Hyponyms:
committedness, ↑commitment, ↑graveness, ↑gravity, ↑sobriety, ↑soberness, ↑somberness, ↑sombreness, ↑sedateness, ↑staidness, ↑solemnity, ↑solemness
Attrubites: ↑serious, ↑frivolous

Useful english dictionary. 2012.