(Latin: a suffix; expressing capacity, fitness to do that which can be handled or managed, suitable skills to accomplish something; capable of being done, something which can be finished, etc.)

A suffix that forms adjectives. The suffix -ible has related meanings; expressing ability, capacity, fitness; capable of, fit for, able to be done, can be done, inclined to, tending to, given to.

This list is only a small sample of the thousands of -able words that exist in English.

imperishable (adjective)
impermeable (adjective), more impermeable, most impermeable
Conveying a surface that does not allow a passage through it; especially; liquids; waterproof: Most buildings have impermeable roofs which prevent rain from passing into the rooms that exist under them.
imperturbable (adjective), more imperturbable, most imperturbable
1. Not easily excited or upset: Despite the bad weather conditions, Rodney had an imperturbable attitude about preparing for his trip.
2. Marked by extreme calm and composure: Aurora had an imperturbable reaction to the criticisms presented by her fellow workers about having to work overtime.
Calm and not easily agitated.
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Calm and not easily disturbed.
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implacable (adjective), more implacable, most implacable
Characteristic of being opposed to someone or something in a very angry or determined way that can't be changed: The politician had an implacable hatred for his opponents.

Usually people who are implacable can't be soothed or satisfied and they refuse to change their behaviors or opinions.

Not yielding or pacified.
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Not capable of being appeased or forgiving.
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imponderable (adjective), more imponderable, most imponderable
Difficult or impossible to estimate, to assess, or to answer: There are some imponderable problems regarding the understanding of a philosophy that involves the study of ideas about life, existence, and other issues that are not part of the physical world.
impregnable (adjective), more impregnable, most impregnable
1. Relating to something which is invincible, powerful, sturdy and mighty: The impregnable mountains prevented the valley from being covered with a significant amount of snow during the winter.
2. Pertaining to unassailable reasons for doing something: The local government had impregnable justifications for doing so much construction on the roads and city streets in Pete's town.
impressionable (adjective)
improbable (adjective)
1. Not probable; unlikely to take place or to be true or to happen.
2. Having a probability too low to inspire belief.
3. Too improbable to be considered believable.
improvable (adjective)
1. Capable of being improved; susceptible to improvement.
2. Capable of being used to advantage; profitable; serviceable; advantageous.
impugnable (adjective)
Subject to being discredited.
imputable (adjective)
The possibility of imputing or ascribing; attributable.
inalienable (adjective), more inalienable, most inalienable
1. Descriptive about that which cannot be transferred to another or to others; such as, inalienable rights.
2. Relating to anything that is incapable of being repudiated or transferred to another person, etc.

That which is referring to inalienable cannot be bought, sold, or transferred from one individual to another; for example, the personal rights to life and liberty guaranteed by the Constitution of the United States are inalienable.

Similarly, there are various types of inalienableproperty; such as, rivers, streams, and highways.

inalterable (adjective); more inalterable, most inalterable
Relating to anything that is not possible to change or to modify: History is inalterable since it has already passed and cannot be replaced or remodelled!

The death of an individual is an inalterable fact that cannot be reversed.

inarable (adjective), more inarable, most inarable
Relating to ground that is incapable of being plowed and cultivated to yield any normal plants: A desert is just one geographical area that is usually an inarable place to grow crops that can be utilized for human and animal consumption.

Since Mexico is primarily mountainous, it has been estimated that about 85% of the country is considered to be inarable.

incalculable (adjective)