| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | impassable |
| Synonyms: | impossible, insuperable, insurmountable, overwhelming |
| Notes: | insuperable means impossible to overcome; insupportable means impossible to tolerate |
| 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: | 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 |
| Main Entry: | impracticable |
| Part of Speech: | adjective |
| Definition: | unrealistic |
| Synonyms: | impossible, imprudent, infeasible, insuperable, unfeasible, unwise |
| Notes: | impractical means 'not advisable to put into practice' while impracticable means 'not capable of being put into practice'; impractical or unpractical is something that can be done but isn't worth doing while impracticable means it can't be done at all |
| Antonyms: | practicable |