Underretained

Part of speech: adjective

Definitions

1. Not kept or held to an adequate extent as intended or required
2. Insufficiently preserved or maintained so that the expected quantity or quality is lacking
3. Describing something that is held on to or maintained less than necessary or desirable

Etymology: "Underretained" is a straightforward English formation: the prefix "under-" (meaning "insufficiently" or "too little") attached to "retained," the past participle of "retain." "Retain" came into English in the late 14th century from Old French "retenir," itself from Latin "retinere," literally "to hold back," built from "re-" (back) and "tenere" (to hold). So the word's core idea is holding something back or keeping hold of it. Adding "under-" to a past participle to form an adjective describing something that was not kept enough is a common pattern in English, seen in words like "underfunded" and "undernourished." The formation is productive, meaning speakers can coin new examples freely, and "underretained" is most often used of things such as memories, information, or fluid, where the sense is that less was kept than was needed or expected.