Impossible or difficult to pronounce or articulate.
A Hungarian baron, with an unpronounceable name, had that very morning been so struck with Lady Penrhyn's beauty, that, not knowing she was married, he laid himself, castle, sabre, and fur pelisses at her feet, for immediate acceptance.
Something, especially an ingredient, that is difficult or impossible to pronounce.
Synthetic fragrances can contain a laundry list of chemicals — hormone disrupters, petroleum-derived unpronounceables, asthma triggers and on and on.
From un- + pronounceable.
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