In a fearless or bold manner; without showing fear or apprehension.
From dreadless (adjective) + -ly (adverbial suffix). Stacks dread + -less + -ly to create an adverb expressing the manner of acting without dread.
Adding -ly to dreadless creates a triple-stacked word formation (dread-less-ly) showing how English builds complex meanings from simple parts—but most people would just say 'fearlessly' instead.
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