cogent
Concise Oxford English Dictionary © 2008 Oxford University Press:
cogent /ˈkəʊdʒ(ə)nt/
▶adjective (of an argument or case) clear, logical, and convincing.
– derivatives
cogency noun,
cogently adverb.
cogency noun,
cogently adverb.
– origin C17: from L. cogent-, cogere ‘compel’.
'cogent' also found in these Oxford entries:

