Crazily specific, appropriate words from other languages.
Untranslatable - Wonderful Foreign Words With No English Equivalent, Illustrated by Ella Frances Sanders. "Mangata (Swedish): n. The road-like reflection of the moon in the water"
German grammar - The imperfect tense
50 Untranslatable Words from Around the World: The foreign terms that can't be translated to English
Commuovere (Italian verb) - Ella Frances Sanders illustrates words held to be untranslatable, to English equivalents, from their native languages
Untranslatable - Wonderful Foreign Words With No English Equivalent, Illustrated by Ella Frances Sanders. "Glas Wen (Welsh): n. This literally means a "blue smile"; one that is sarcastic or mocking.
Brilliant German Insults We Need In English. I'm not saving this for German class. Nope definitely not.