Involving or given to excessive or insincere praise; designed to please someone by complimenting them falsely.
From 'flatter' + the adjectival suffix '-ous' (meaning 'full of' or 'characterized by'). The '-ous' suffix comes from Latin and is used to create adjectives describing qualities.
This older form 'flatterous' is less common than 'flattering' today, but both mean the same thing—English often has multiple ways to say something, giving writers options!
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