I often notice inconsistencies in word formations. The word "bad" becomes "badly" by adding the suffix "-ly" to form an adverb. Similarly, "good" would be expected to become "goodly" following the same pattern. However, the correct adverb form of "good" is actually "well" as explained in the past question of EL&U: The Use of "Goodly" that unfortunately focuses on using the word 'goodly' as an adjective which has actually become archaic.
What's the historical or linguistic reason behind this irregularity? Why does "good" not follow the same pattern as "bad" to become "goodly", which is actually an archaic or poetic word with a different meaning?"
It's similar to other such patterns like:
- Fast to fastly: "Fast" becomes "fast" (not "fastly") when used as an adverb, whereas "good" becomes "well" (not "goodly").
- Hard to hardly: "Hard" becomes "hard" (not "hardly") when used as an adverb, whereas "hardly" means "barely" or "scarcely".
- Far to farther/furthest: "Far" has irregular comparative and superlative forms, whereas most adjectives would follow a more predictable pattern (e.g., "big" to "bigger" to "biggest").