(Latin: suffix; expressing ability, capacity, fitness, or "that which may be easily handled or managed")

Just a few examples out of hundreds of words presented as the noun forms of -able; forming nouns of quality from, or corresponding to, adjectives in -able; the quality in an agent that makes an action possible. The suffix -ible has related meanings.

impeccable (im PEK uh b'l) (adjective), more impeccable, most impeccable
1. So perfect or flawless as to be beyond criticism: Sam had an impeccable record as a reliable mail carrier in Helena's neighborhood.
2. Concerning something or someone being without faults or errors: Dr. Brown’s reputation as an impeccable physician makes him a desirable consultant for other medical doctors.
Without sin, fautless.
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impregnability (s) (noun) (no plural)
1. The quality or condition of being invincible or impossible to defeat or to destroy: As a boxer, Edward utilized his impregnability and so he was too powerful to be overcome by his opponents.
2. Etymology: from Middle French imprenable; im-, "not", + prendre, "to take" + -able, "able to be the object of an action".
1. Not likely to be true or to occur or to have occurred.
2. The quality or condition of being improbable; unlikelihood.
3. Something improbable or unlikely.
Lack of ability, capacity, means, or power.
inalienability (s) (noun) (usually no plural)
1. That which cannot be transferred to another or to others.
2. Incapable of being repudiated or conveyed to another person.
3. Not subject to forfeiture.
inalterable (adjective), more inalterable, most inalterable
Relating to anything that is not possible to change or to modify.
The quality of being unthinkable; incapable of being thought.
incurability (s) (noun), incurabilities (pl)
1. The condition in which a healing is impossible: The patient was suffering from an incurable disease.
2. Incapable of being altered, as in disposition or habits.
ineffable (adjective) (not comparable)
1. Characterized by being incapable of expressing one's feelings in words: After Leticia recovered from her coma, she felt ineffable happiness when she saw her children again.
2. Relating to something that is so great that it can't be verbally communicated or described: When Caleb won the singing contest, he was overcome with ineffable joy and excitement.
Relating to being unable to express happiness in words.
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Descriptive of someone who can't show his or her joy.
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Referring to a person who describe his or her rage and anger.
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1. Not to be avoided, changed, or resisted.
2. Incapable of being evaded; inescapable: "Death is considered by many to be an ineluctable destiny."
inevitability (s) (noun), inevitabilities (pl)
Something that is certain to happen and can not be prevented.
1. Easily ignited and capable of burning rapidly; flammable.
2. Quickly or easily aroused to strong emotion; excitable.

Historically, flammable and inflammable mean the same thing; however, the presence of the prefix in- has misled many people into assuming that inflammable means "not flammable" or "noncombustible".

The prefix in- as used in inflammable is not, however, the Latin negative prefix in-, which is related to the English un- and that appears in such words as indecent and inglorious.

The in- used in "inflammability" is an intensive prefix derived from the Latin preposition in. This prefix also appears in the word enflame, but many people are not aware of this derivation, and for clarity's sake it is advisable to use only flammable to give warnings.

inoculable, inoculability
1. Capable of being inoculated.
2. Capable of communicating disease, or of being communicated, by inoculation.
3. Susceptible to a disease transmitted by inoculation or transmissible by inoculation.
4. That which can be used in an inoculation .
insatiability (s) (noun), insatiabilities (pl)
Incapable of being pleased or content.