Similar words: doubtful, doubtfully, doubtful debts, wistfulness, restfulness, forgetfulness, boastfulness, fruitfulness. Meaning: ['daʊtfʊlnɪs] 
n. 1. the state of being unsure of something 2. uncertainty about the truth or factuality of existence of something.
n. 1. the state of being unsure of something 2. uncertainty about the truth or factuality of existence of something. 
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1 This disease of doubtfulness and discouragement is an epidemic which soon spreads amongst the Lord's flock.
2 All doubtfulness vanished after the testimony of the key witnesses.
3 The doubtfulness of one's birthplacemakesthemost fundamental questions and ambivalence about existence(freedom and home-coming) appearillusionary.
4 Ambiguity refers literally to doubtfulness or uncertainty in expressive meaning of the text. An expression may contain multiple meanings, and this is an important technique of poetry.
5 All doubtfulness vanish after the testimony of the key witness.
More similar words: doubtful, doubtfully, doubtful debts, wistfulness, restfulness, forgetfulness, boastfulness, fruitfulness, rightfulness, deceitfulness, respectfulness, thoughtfulness, usefulness, awfulness, successfulness, wilfulness, lawfulness, sinfulness, youthfulness, carefulness, joyfulness, wastefulness, painfulness, harmfulness, mindfulness, willfulness, soulfulness, fearfulness, bashfulness, forcefulness.