informally

The word "informally" is built upon the core adjective "formal," which traces back to the Latin formalis, derived from forma, meaning "shape, mold, or pattern." The prefix "in-," also from Latin, acts as a straightforward negator, turning "formal" into its opposite, "informal," meaning "not according to prescribed form or convention." Finally, the Old English adverbial suffix "-ly" is appended, a common Germanic construction for converting adjectives into adverbs describing manner. Thus, the etymological journey is a logical layering: from the concept of a set form or structure (forma), to its negation, and finally to the adverbial form describing actions performed in a manner that deviates from that structure.

Structure: in (not) + formal (relating to form) + ly (adverb suffix) - in: A prefix of Latin origin, meaning "not" or "without". It functions as a negator. - formal: An adjective of Latin origin (from formalis), meaning "relating to outward form, structure, or convention". It functions as the core descriptive element. - ly: A suffix of Old English origin, used to form adverbs from adjectives. It indicates the manner or way of an action.