In a manner that causes or suggests aching pain; characterized by deep longing or yearning.
From 'aching' (present participle of 'ache') + adverbial suffix '-ly'. By the 17th century, it extended metaphorically from physical pain to emotional pain or longing.
Poets absolutely love 'achingly'—it appears in countless romantic verses to describe emotional pain that's just as real as physical pain, showing how language maps feelings onto body sensations!
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