He was so frightened and hysterical that he was unable to tell a coherent story.
Advanced English Dictionary
+adjective 1 (of ideas, thoughts, arguments, etc.) logical and well organized; easy to understand and clear: a coherent narrative / account / explanation + a coherent policy for the transport system 2 (of a person) able to talk and express yourself clearly: She only became coherent again two hours after the attack. Antonym: INCOHERENT coherently adverb: to express yourself coherently
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