nüchternsten
Nüchternsten is the superlative form of the German adjective nüchtern, meaning sober. It describes the most sober individuals, groups, or things within a larger set. The form is primarily used in the plural and often appears after definite determiners such as die, den, or dem (as in die nüchternsten Anwesenden, den nüchternsten Kandidaten).
In practice, nüchternsten is employed to compare a collection to others by identifying the subset that is
Grammatically, the ending -sten signals the plural superlative in attributive position when coupled with definite articles
Etymology traces nüchternsten to nüchtern (sober) plus the standard plural superlative ending -sten, a regular pattern
See also: German adjectives, comparative and superlative forms, nüchtern.