- Serene: Unfuffled; tranquil; unclouded.
- Skeptical: Not easily persuaded or convinced; doubting the fundamental doctrines of religion.
- Sobriety: Seriosness, gravity, or solemnity; absence of alchoholic intoxication.
- Solemn: Observed or done according to ritual or tradition; formal; serious or earnest; arousing feelings of awe; very impressive.
- Soporific: Causing sleep; drowsy.
- Sporadic: Occurring at irregular intervals; isolated.
- Spurious: Lacking authenticity; counterfeit; false.
- Squalid: Dirty or wretched in appearence; morally repulsive; sordid.
- Stagnate: To lie inactive; to fail to progress or develop.
- Stoic: Indifferent to or uneffected by pleasure or pain; impassive