rightly

the word "rightly" is a transparent formation from its root adjective "right." the adjective "right" originates from the proto-germanic rehtaz, which itself descends from the proto-indo-european root h₃reǵ- meaning "to move in a straight line," "to direct," or "to rule." this core concept of straightness evolved metaphorically into notions of correctness, justice, and conformity to a standard. the addition of the old english adverbial suffix "-ly" (from -līce) directly converts the adjective into an adverb, creating a word that means "in a correct, just, or proper manner." the semantic journey from a physical direction to an abstract moral or logical judgment is a classic example of linguistic evolution.

Structure: right (correct) + ly (adverb suffix) right (from old english riht, meaning "correct, just, straight") + ly (from old english -līce, an adverbial suffix forming adverbs from adjectives)