Starchily is an adverb used to describe behavior or speech that is formal and stiff, often lacking in warmth or flexibility. Synonyms for starchily include rigidly, formally, rigidly, primly, and haughtily. Other possible synonyms for starchily, depending on context, include ceremoniously, decorously, reservedly, and coldly. These words can be used to describe someone's demeanor or appearance, as well as their tone of voice or choice of language. For example, a person who speaks starchily may come across as aloof or pretentious, while someone who speaks more casually may be seen as more approachable and relatable.