This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state or quality of being distrustful or doubtful; distrust; mistrust.

n. The state of being distrustful or suspicious; want of confidence.

n. the trait of not trusting others

"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."

trust    assurance    reliance   

distrusted    distrustfulness    distrusting    distrusts   

dubiousness    dubiety    incertitude    doubt    doubtfulness    uncertainty   

distrusted    distrusting    distrustful    distruster   

doubt    mistrust    misdoubt    suspect    jealouse    suspicion    misgiving    jealousy    heartburn   

adjust    antitrust    brust    bused    bussed    bust    combust    crust    cussed    discussed   

dislike    jealousy    uneasiness    discontent    mistrust    hostility    reluctance    distaste    suspicion    dismay