All 5 Uses

diffident
in
Rebecca, by Daphne du Maurier
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At any rate I have lost my diffidence, my timidity, my shyness with strangers.†
Chpt 2

diffidence = hesitancy and unassertiveness due to a lack of self-confidence
I could see she despised me, marking with all the snobbery of her class that I was no great lady, that I was humble, shy, and diffident.†
Chpt 7

diffident = hesitant and unassertive
My old fears, my diffidence, my shyness, my hopeless sense of inferiority, must be conquered now and thrust aside.
Chpt 19 *

diffidence = hesitancy and unassertiveness due to a lack of self-confidence
Beatrice, and her rather diffident negative attitude.†
Chpt 20

diffident = hesitant and unassertive
His voice was diffident, careless, but his face was still grey.†
Chpt 27

Definitions:

(1) (diffident)
hesitant and unassertive -- often due to a lack of self-confidence
(2) (meaning too rare to warrant focus)