IPA: /ˈeɪkɪŋli/
KK: /ˈeɪkɪŋli/
In a way that expresses deep emotional pain or longing.
She looked at him achingly, her eyes filled with longing.
Achingly → It is formed from "ache" (from Old English "æcan", meaning to suffer or feel pain) and the suffix "-ly" (meaning in a manner of). The word "achingly" describes something done in a manner that causes or expresses pain or discomfort.
Think of the word 'ache' which means to feel pain, and remember that 'achingly' describes something done in a way that expresses that pain.