infeasible

not capable of being carried out or put into practice; "refloating the sunken ship proved impracticable because of its fragility"; "a suggested reform that was unfeasible in the prevailing circumstances"

यही कारण है कि न केवल खगोलशास्त्री बल्कि दूसरे लोग भी उनको इस्तेमाल करना न केवल उकताहटपूर्ण बल्कि अव्यावहारिक मानते हैं।

The environmental arms race may go even farther rendering every kind of war infeasible.