impossible or very difficult to break, damage, or destroy
adjective - kept safe from harm, damage, danger, or unwanted change
adjective - based on ideas or plans that are unlikely to become reality; not practical or realistic
noun - a person who has original and imaginative ideas about what the future could or should be like
adjective - having or showing original and imaginative ideas about what the future could or should be like
noun, formal - a condition that causes physical or mental suffering, especially an illness or a problem that lasts for a long time
noun - a thing or a personthat keeps someone or something safe
noun - a small caterpillar that makes a fine thread used to make cloth
adverb - in a way that is awkward and not careful
adjective - visually perfect, ideal, or beautiful, as if carefully arranged for a photograph
adverb - In a way that is not clear or not said openly