verecund

/ˈvɛrɪˌkʌnd/

adjective

1. (rare) shy, modest, bashful; especially because of a lack of self-confidence
 

synonyms: 

diffident, doubting, doubtful, hesitant, humble, insecure, meek, reticent, self-effacing, self-conscious, shrinking, timid, timorous, unassertive, unassuming, uncertain, unconfident, unsure;

word origin:

from latin verēcundus diffident, from verērī to fear
.