Yes, it is a plural noun. The verb is indulge and the adjective
indulgent.
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He is so Indulgent. Being indulgent is great quality.
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As indulgent as a decadent dessert.
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The verb form of indulgent is indulge.
As in "to indulge something".
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Its appropriate to be indulgent to another when one loves or
like the other person and no actually financial or person loss can
occur due to being indulgent.