Synonyms of the word 
DIFFIDENCE → SELF-DISTRUST - SELF-DOUBT - TIMIDITY - TIMIDNESS - TIMOROUSNESS
diffidence
- n. The state of being diffident, timid or shy; reticence or self-effacement.
- n. (obsolete) Mistrust, distrust, lack of confidence in someone or something.
self-distrust
- n. Distrust of, or lack of confidence in, oneself or in one's own powers.
self-doubt
- n. The doubting of one's own abilities.
timidity
- n. shyness.
timidness
- n. The property of being timid; shyness.
timorousness
- n. The property of being timorous.
If you are interested in words, visit the following sites :
- wiktionary.org/diffidence For complete definition of a word
- 1word.ws/diffidence to play with words, suffixs, prefixs, etc.