Resembling or characteristic of a balloon; round, puffy, inflated, or tending to expand easily.
From 'balloon' plus the adjectival suffix '-ish' (from Old English), meaning 'somewhat like' or 'having qualities of.'
Describing something as 'balloonish' is a creative way to say puffy—Renaissance painters used the term for cloud formations and inflated clothing in their works.
Complete word intelligence in one call. Free tier — 50 lookups/day.