| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | not beatable |
| Synonyms: | invincible, unconquerable, unexcelled, unsurpassable |
| Antonyms: | beatable |
| Main Entry: | indomitable |
| Part of Speech: | adjective |
| Definition: | steadfast, unyielding |
| Synonyms: | dogged, impassable, impregnable, insuperable, insurmountable, invincible, invulnerable, obstinate, pertinacious, resolute, ruthless, staunch, stubborn, unassailable, unbeatable, unconquerable, undefeatable, unflinching, willful |
| Antonyms: | beatable, conquerable, unstable, weak, yielding |
| Main Entry: | infallible |
| Part of Speech: | adjective |
| Definition: | unerring, dependable |
| Synonyms: | acceptable, accurate, agreeable, apodictic, authoritative, certain, correct, effective, effectual, efficacious, efficient, exact, faultless, flawless, foolproof, handy, helpful, impeccable, incontrovertible, inerrable, inerrant, omniscient, perfect, positive, reliable, satisfactory, satisfying, sure, surefire, true, trustworthy, unbeatable, undeceivable, unfailing, unimpeachable, unquestionable, useful |
| Antonyms: | erring, fallible, faulty, imperfect |
| Main Entry: | insurmountable |
| Part of Speech: | adjective |
| Definition: | impossible |
| Synonyms: | forget it, hopeless, impassable, impregnable, inaccessible, indomitable, ineluctable, insuperable, invincible, no way, no-win, not a prayer, overwhelming, unbeatable, unconquerable, unmasterable |
| Antonyms: | attainable, beatable, defeatable, possible, surmountable |
| Main Entry: | invincible |
| Part of Speech: | adjective |
| Definition: | indestructible |
| Synonyms: | bulletproof, impassable, impregnable, indomitable, insuperable, inviolable, invulnerable, irresistible, powerful, strong, unassailable, unattackable, unbeatable, unconquerable, undefeatable, unsurmountable, untouchable, unyielding |
| Antonyms: | beatable, breakable, conquerable, destructible |
| Main Entry: | invulnerable |
| Part of Speech: | adjective |
| Definition: | invincible |
| Synonyms: | bulletproof, impassable, impenetrable, impregnable, indestructible, powerful, secure, strong, unbeatable, untouchable |
| Main Entry: | unconquerable |
| Part of Speech: | adjective |
| Definition: | insurmountable |
| Synonyms: | impregnable, indefeasible, indomitable, inexpugnable, innate, insuperable, intractable, invincible, invulnerable, irrepressible, resistant, secure, unbeatable, unsurpassable, unyielding |
| Antonyms: | conquerable |