Submitted by György Chityil ... on Sat, 01/20/2018 - 01:06 Hierarchy: AdjectiveDescription: {{superlative of|stiff}} Most rigid, most inflexible, most unbending.Ngram: stiffestNgram Text: stiffestSource: WiktionaryIssue: 0Wiktionary tag: superlative ofstiffNgram Count: 1