cautionary
UK: ˈkɔːʃənəri | US: ˈkɔːʃəneri
adj. serving as a warning
adj. intended to advise or alert
The word "cautionary" derives from the noun "caution," which originates from the Latin cautio (meaning "care, foresight"), itself from cavēre ("to be on guard"). The suffix "-ary" (from Latin -arius) forms adjectives indicating "related to" or "pertaining to." Thus, "cautionary" literally means "related to a warning," reflecting its modern use to describe advice or tales meant to prevent harm.
The documentary included cautionary tales about climate change.
Her tone was cautionary, urging us to reconsider the risks.
The teacher shared a cautionary story about cheating.
The article served as a cautionary reminder about online scams.
His speech was filled with cautionary advice for young entrepreneurs.