Adjective : An alert scientist is distrustful of coincidences.    From Dictionary.com. 

"You show a distrustfulness that is ... scarcely friendly.".    From Wordnik.com.  [The Boat of a Million Years]

Jonathan proceeded to give me a speech about how my distrustfulness seems to be a reoccurring theme.    From Wordnik.com.  [Horny Man and His Early Morning Phone Call] Reference

You know, ever since watching him on TV for the first time back in June, the Midterm Roundup has felt an eerie, sort of inexplicable sense of distrustfulness toward Tom Kean, Jr.    From Wordnik.com.  [Midterm Roundup] Reference

So they grew up to be grave, taciturn men, still retaining the same strong resemblance of face and figure, though time had somewhat altered the features, by fixing a different expression on each, giving to John a fierce resolution, and to James a lurking distrustfulness of look.    From Wordnik.com.  [The Atlantic Monthly, Volume 07, No. 39, January, 1861] Reference

If she stopped now, Christine, in this sudden new freak of distrustfulness, would be sure to misunderstand.    From Wordnik.com.  [The Desert and the Sown] Reference

And then, gradually, it faded out and left a blank; the old expression of anxiety and distrustfulness returned.    From Wordnik.com.  [King John of Jingalo The Story of a Monarch in Difficulties] Reference

Ah -- if, after this day, you ever see any interpretable sign of distrustfulness in me, you may be 'cutting' again, and I will not cry out.    From Wordnik.com.  [The Letters of Robert Browning and Elizabeth Barrett Barrett, Vol. 1 (of 2) 1845-1846] Reference

But that strange distrustfulness of which he had spoken, or the hesitation which the strongest and bravest men have at times, came between.    From Wordnik.com.  [The Laurel Bush] Reference

This latter upbringing but confirms the customer's distrustfulness that the vender has more to acquire from whatever advice or dealings than the buyer.    From Wordnik.com.  [xml's Blinklist.com] Reference

Men were among us by hundreds whom the ceaseless distrustfulness of their governments had followed privately, by means of appointed agents, to our shores.    From Wordnik.com.  [The Woman in White] Reference

This, in turn, had engendered a chronic distrustfulness, and his mind and character had become so warped that he was a very disagreeable man to deal with.    From Wordnik.com.  [The God of His Fathers: Tales of the Klondyke] Reference

Such distrustfulness in Mitya, such lack of confidence even to him, to Alyosha — all this suddenly opened before Alyosha an unsuspected depth of hopeless grief and despair in the soul of his unhappy brother.    From Wordnik.com.  [The Brothers Karamazov] Reference

He was afraid of himself, lest in his strong feeling he might break his implied promise not even to suggest his love, when she came to thank him, and so, in self-distrustfulness, he was beginning to shun her also.    From Wordnik.com.  [What Can She Do?] Reference

She controlled her alert distrustfulness, and passed from him to the landlady, for her feet were wet and cold, the skirts of her dress were soiled; generally inspecting herself, she was an object to be shuddered at, and she was grateful to Vernon for his inattention to her appearance.    From Wordnik.com.  [Complete Project Gutenberg Works of George Meredith] Reference

A ruled undemonstrative distrustfulness is so habitual, not with business-men so much, as with men who know their kind in less shallow relations than business, namely, certain men-of-the-world, that they come at last to employ it all but unconsciously; and some of them would very likely feel real surprise at being charged with it as one of their general characteristics.    From Wordnik.com.  [Billy Budd] Reference

Ah ” if, after this day, you ever see any interpretable sign of distrustfulness in me, you may be 'cutting' again, and I will not cry out.    From Wordnik.com.  [The Letters of Robert Browning and Elizabeth Barrett Barrett]

Fears of illegal immigration, shadow government, terrorism, war, failing economy, loss of sovereignty and liberty indicate a distrustfulness of the intentions of our government and I think is well founded.    From Wordnik.com.  [World-News (Independent Media Source)] Reference