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 quality or state of being diffident; timidity or shyness.

n. The state of being diffident, timid or shy; reticence or self-effacement.

n. Mistrust, distrust, lack of confidence in someone or something.

n. The state of being diffident; distrust; want of confidence; doubt of the power, ability, or disposition of others.

n. Distrust of one's self or one's own powers; lack of self-reliance; modesty; modest reserve; bashfulness.

n. Distrust; want of confidence in regard to anything; doubt of the ability or disposition of others.

n. More especially, distrust of one's self; want of confidence in one's own ability, worth, or fitness; retiring disposition; modest reserve; shyness.

n. Synonyms Modesty, Shyness, etc. (see bashfulness), fear, timidity, hesitation, apprehension.

n. lack of self-confidence

"Some were put off by what they termed his diffidence, his driving ambition and perfectionism."

timidity    timorousness    timidness   

unassertiveness    hesitancy    hesitance   

hesitation    timidity    bashfulness    suspicion    humility    doubt    apprehension    fear    distrust    modesty   

shyness    reluctance    awkwardness    reticence    bashfulness    deference    hesitancy    hesitation    modesty    nervousness