dif·fi·dent (dĭfĭ-dənt, -dĕnt′)
Lacking or marked by a lack of self-confidence; shy and timid: He was too diffident to express his opinion.
[Middle English, from Latin diffīdēns, diffīdent-, present participle of diffīdere, to mistrust : dis-, dis- + fīdere, to trust; see bheidh- in the Appendix of Indo-European roots.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.