In a manner that does not fade; in a way that remains unchanged in color or quality over time.
Adverbial form of 'fadeless,' using the '-ly' suffix. Stacked suffixes: fade + -less + -ly create an adverb expressing the manner of non-fading.
This word piles suffixes in a way that feels clunky to native speakers—'fadelessly' works grammatically but sounds awkward, showing that even though English's morphological rules are productive, not all combinations feel natural.
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