IPA: /ˌoʊvərɪnˈdʌldʒənt/
KK: /oʊvərɪnˈdʌldʒənt/
Tending to give in to desires or pleasures too much, often leading to negative consequences.
The overindulgent parents spoiled their children with too many gifts.
Overindulgent → It is formed from "over-" (meaning excessively) and "indulgent" (from Latin "indulgere", meaning to be lenient or to yield to). The word describes a state of being excessively lenient or yielding, especially in terms of allowing oneself to enjoy pleasures or luxuries.
Think of being 'excessive' ('over-') in being 'lenient' or 'yielding' ('indulgent') — that's why overindulgent means allowing too much enjoyment.