British spelling: causing extreme pain or mental distress; intensely difficult or unbearable to experience or witness.
The present participle and gerund form of 'agonise,' formed by adding the '-ing' suffix while maintaining British spelling conventions.
British writers use 'agonising' to describe not just physical pain but the unbearable tension of waiting—'an agonising delay,' 'an agonising silence'—it's one of those words that makes the ordinary sound dramatic.
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