Submitted by György Chityil ... on Wed, 02/28/2018 - 17:38 Lemma: challengeNgram Count: 1Starts with letter: YesIndefinite Article: aGoogle Ngram Count: 5268114Sense count: 3Contained in other ngrams: 28Hierarchy: AdjectivePast ParticipleForms: challengingchallengesForms Count: 2