unsailable
/ʌnˈseɪvəbəl/Definitions
1. adjective
Impossible to sail against; prevailing or dominating in a particular field or sphere, especially a sport.
“The team’s unsailable lead made it difficult for their opponents to catch up.”
2. noun
A situation or condition that is impossible to sail against or overcome.
“The unsailable winds made it a challenging day for the sailors.”