| Main Entry: | airtight |
| Part of Speech: | adjective |
| Definition: | certain |
Synonyms: |
incontestable, indisputable, invulnerable, irrefutable, unassailable |
Antonyms: |
possible, questionable, uncertain |
| Main Entry: | impervious |
| Part of Speech: | adjective |
| Definition: | unable to be penetrated |
Synonyms: |
closed to, hermetic, immune, impassable, impassive, impenetrable, impermeable, imperviable, inaccessible, invulnerable, resistant, sealed, tight, unaffected, unapproachable, unmoved, unpierceable, unreceptive, watertight |
Antonyms: |
exposed, open, penetrable, responsive, sensitive, vulnerable |
| Main Entry: | impregnable |
| Part of Speech: | adjective |
| Definition: | unyielding |
Synonyms: |
firm, fortified, impenetrable, indestructible, invincible, invulnerable, secure, solid, strong, unassailable |
| 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: | 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: | sacred |
| Part of Speech: | adjective |
| Definition: | protected |
Synonyms: |
dedicated, defended, guarded, immune, inviolable, inviolate, invulnerable, sacrosanct, secure, shielded, untouchable |
Antonyms: |
open, unprotected, vulnerable |
| Main Entry: | safe |
| Part of Speech: | adjective |
| Definition: | free from harm |
Synonyms: |
buttoned up, cherished, free from danger, guarded, home-free, impervious, impregnable, in safety, intact, inviolable, invulnerable, maintained, okay*, out of danger, out of harm's way, preserved, protected, safe and sound, safeguarded, secure, sheltered, shielded, sitting pretty, snug, tended, unassailable, undamaged, under lock and key, under one's wing, unharmed, unhurt, uninjured, unmolested, unscathed, unthreatened, vindicated, watched |
Antonyms: |
exposed, unguarded, unprotected, unsafe, vulnerable |
| Main Entry: | tight |
| Part of Speech: | adjective |
| Definition: | close, snug |
Synonyms: |
bound, clasped, close-fitting, compact, constricted, contracted, cramped, crowded, dense, drawn, enduring, established, fast, firm, fixed, hidebound, inflexible, invulnerable, narrow, quick, rigid, secure, set, skintight, solid, stable, steady, stiff, strained, stretched, strong, sturdy, taut, tenacious, tense, thick, tightened, unbending, unyielding |
| Notes: | the choice of 'tight' or 'tightly' depends on whether it is the result or the application that is emphasized; if it is an enduring state, you would use 'tight' |
Antonyms: |
comfortable, free, loose, open, slack |
| Main Entry: | unbreakable |
| Part of Speech: | adjective |
| Definition: | strong, tough |
Synonyms: |
adamantine, armored, brass-bound, durable, everlasting, firm, incorruptible, indestructible, infrangible, invulnerable, lasting, nonbreakable, perdurable, resistant, rugged, shatterproof, solid, tight, toughened, unshakable, unyielding |
Antonyms: |
breakable, delicate, fragile, weak |