IPA: /ˈrɛtɪsəns/
KK: /ˈrɛtɪsəns/
The quality of being quiet or not revealing one's thoughts easily; a reluctance to speak or express feelings.
Her reticence in meetings often made it difficult for her colleagues to understand her opinions.
Reticence → It is formed from "reticent" (from Latin "reticentem", meaning remaining silent or reserved) and the suffix "-ence" (meaning the state or quality of). The word "reticence" refers to the quality of being reserved or not revealing one's thoughts readily.
Think of someone who is 'remaining silent' ('reticent') and how that reflects their 'quality' ('-ence') of being reserved.