seriousness (n.)
- abandon
- ardor
- commitment
- committedness
- decision
- decisiveness
- decorousness
- dedication
- definiteness
- demureness
- determinateness
- determination
- devotedness
- devotion
- devoutness
- earnest
- earnestness
- faith
- faithfulness
- fervency
- fervidness
- fervor
- fidelity
- fire
- formality
- gravity
- grimness
- heartiness
- heat
- intensity
- intentness
- loyalty
- moderation
- obstinacy
- passion
- passionateness
- perseverance
- persistence
- purpose
- purposefulness
- relentlessness
- resoluteness
- resolution
- resolve
- sedateness
- self-will
- sincerity
- single-mindedness
- soberness
- sobersides
- sobriety
- solemnity
- somberness
- spirit
- staidness
- temperance
- tenacity
- thoughtfulness
- vehemence
- warmth
- weightiness
- will
- zeal
