了不得 (written pronunciation: liǎo bù dé in standard Chinese; the input pinyin 'le' is likely an error) is a stative verb with opposite meanings depending on context: it can mean 'terrific' and 'extraordinary' in a positive sense, or 'terrible' and 'awful' in a negative sense. It is also commonly used as a complement after adjectives or verbs with 得 (de) to indicate an extreme degree, e.g., 高兴得∼ (extremely happy). The tone of the sentence determines which sense is intended, so always check the surrounding words.