(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.

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), more impressionable, most impressionable
Inclined to be easily influenced or swayed: Lea was very impressionable and was quite susceptible to being persuaded to do things that were not always good for her!
improbable (adjective), more improbable, most improbable
1. Unlikely to take place, to be true, or to happen: It is improbable that the temperature will be 30°C. and hot the next day taking into consideration that it is presently -10°C. and snowing heavily at the moment!
3. Too far-fetched to be considered believable: It is really rather improbable that Tom's parents are millionaires considering that they live in a disreputable part of town!
improvable (adjective), more improvable, most improvable
1. Capable of being refined; susceptible to betterment: Mrs. Thompson thought that Jill's handwriting was improvable if she practised more with forming the letters in the words carefully.
2. Capable of being used to advantage; profitable; serviceable; advantageous: The cultivation of the land would be improvable if the watering system was more efficient.
impugnable (adjective), more impugnable, most impugnable
Suitable to being discredited, questioned , or open to verbal arguments: The man's motives for taking his wife's car without asking her or giving any reasons for his action was impugnable, also because he didn't even bring it back at all!
imputable (adjective), more imputable, most imputable
The possibility of being assigned or credited to; attributable: The imputable oversights were due to careless proofreading.
inalienable (adjective), more inalienable, most inalienable
1. Insusceptible ot being taken or given away from the owner: One inalienable right of a person is the freedom of religion.
2. Relating to anything that is incapable of being repudiated or transferred to another person, etc.: That which is referred to as inalienable cannot be bought, sold, or transferred from one individual to another.

The personal rights to life and liberty guaranteed by the Constitution of the United States are inalienable.

Similarly, there are various types of inalienable property, 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), more incalculable, most incalculable
1. Referring to an individual's character or mood that cannot be predicted: Jim was a bit incalculable when he had drunk one glass of wine and more incalculable when he was drunk and it was difficult to foretell what his behavior would be like.
2. Pertaining to something too great to be estimated (not comparable): When the villa burned down, the costs for rebuilding it were incalculable and could not even be assessed.
3. Inconceivable to compute by mathematics (not comparable): The assignment that Judy had to do for geometry was totally incalculable and she told her teacher the next day.
incapable (adjective), more incapable, most incapable
1. Unable to do something: Sally was incapable of using her right arm because it was broken and it had to be operated on.
2. Not susceptible to or not being able to admit to something: Jane was such a truthful person and incapable of lying to anyone.
3. Not possessing the necessary requirements of performing a task or function: Since little Jimmy was only one year old, he was still incapable of reading a novel!