- An unknown terrorist group has claimed responsibility for this morning's bomb attack.
- A generation ago, home computers were virtually unknown.
- The article is of unknown authorship .
- The director took a calculated risk in giving the film's main role to an unknown actor.
- The very concept of free speech is unknown to them.
Thesaurus: synonyms and related words
También encontrarás palabras, frases y sinónimos relacionados con los temas: