In a manner that is extremely pleasing or delightful to the senses.
From 'delectable' with the adverb-forming suffix '-ly'. The root is Latin 'delectare' (to charm or please), which itself may derive from 'de-' (thoroughly) and 'lacere' (to entice).
The word became especially popular in food writing, where you'll see 'delectably creamy' or 'delectably sweet'—it's the adverb version that lets writers make their descriptions more vividly appealing.
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