We found one dictionary that defines the word understimulating:

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1. understimulating: Wiktionary

Opposite: stimulating, exciting, engaging, thrilling, invigorating ▸ Words similar to understimulating ▸ Usage examples for understimulating ▸ Idioms related to understimulating ▸ Wikipedia articles (New!) ▸ Words that often appear near understimulating ▸ Rhymes of understimulating ▸ Invented words related to understimulating