We found one dictionary that defines the word underfilled:

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1. underfilled: Wiktionary

Opposite: full, filled, packed, loaded, brimming ▸ Words similar to underfilled ▸ Usage examples for underfilled ▸ Idioms related to underfilled ▸ Wikipedia articles (New!) ▸ Words that often appear near underfilled ▸ Rhymes of underfilled ▸ Invented words related to underfilled