so

sobriety (n.) sedate, calm (Jason believed that maintaining his sobriety in times of crisis was the key to success in life.)

solicitous (adj.) concerned, attentive (Jim, laid up in bed with a nasty virus, enjoyed the solicitous attentions of his mother, who brought him soup and extra blankets.)

solipsistic (adj.) believing that oneself is all that exists (Colette’s solipsistic attitude completely ignored the plight of the homeless people on the street.)

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soluble (adj.) able to dissolve (The plot of the spy film revolved around an untraceable and water-soluble poison.)

solvent 1. (n.) a substance that can dissolve other substances (Water is sometimes called the universal solvent because almost all other substances can dissolve into it.) 2. (adj.) able to pay debts (Upon receiving an unexpected check from her aunt, Annabelle found herself suddenly solvent.)

somnolent (adj.) sleepy, drowsy (The somnolent student kept falling asleep and waking up with a jerk.)

sophomoric (adj.) immature, uninformed (The mature senior rolled her eyes at the sophomoric gross-out humor of the underclassman.)

sovereign (adj.) having absolute authority in a certain realm (The sovereign queen, with steely resolve, ordered that the traitorous nobleman be killed.)