Как по Английски будет wirbellose

Lack of courage, resolve, or strength of purpose; disinclination to act or assert oneself; weakness, timidity, spinelessness. compare "invertebrate", "invertebrate".

With plural agreement. originally (in the system of lamarck): a major division of the animal kingdom comprising all animals other than the vertebrates. in later use (usually in form invertebrata): a collective term for invertebrates (now rare in technical use).