In Japanese, ideographs (Kanji) are paired with syllabic characters (Hiragana) to express things which Kanji alone cannot. Foreign words are spelled in Katakan

In Japanese, ideographs (Kanji) are paired with syllabic characters (Hiragana) to express things which Kanji alone cannot. Foreign words are spelled in Katakana (another syllabic script). There's also romaji -- a way of writing Japanese in the familiar Latin alphabet. Incompleteness is manifestly NOT a problem for an ideographic script.