- insurmountable
- adj1. insuperable, overwhelming, overpowering, overcoming, overmastering, overmatching; oppressive, burdensome, backbreaking, crushing, demoralizing, defeating.2. invincible, unconquerable, impenetrable, inviolable, inexpugnable; impregnable, invulnerable, indestructible, undestroyable, imperishable, nonperishable, Obs., Rare. imperdible; unassailable, unattackable, undefeatable, unbeatable; formidable, powerful, mighty; tenable, secure, safe, safe and sound; stout, sturdy, strong, solid, stable, staunch, stanch; indomitable, redoubtable, unyielding.
A Note on the Style of the synonym finder. 2014.