adjective
Etymology: Middle English aking, from present participle of aken to ache
: that aches : causing pain or distress
what peaceful hours I once enjoyed … but they have left an aching void — William Cowper
for shade there is only this aching and hollow waste of rock — Edith Sitwell
: vexatious
a useful work of reference in a field where students have long been conscious of an aching gap — Economist
• ach·ing·ly adverb