Able to be expressed, squeezed out, or extracted; capable of being articulated or communicated.
From 'exprime' (a rare verb meaning to press or squeeze out) plus the suffix '-able' meaning 'capable of being.' This is an extremely rare English word with roots in Latin exprimere.
Exprimable is so rarely used that most modern dictionaries don't even list it—yet it perfectly describes the feeling of thoughts you can't quite put into words, making it an ironically untranslatable word about translatability.
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