Someone who is impecunious has very little money, especially over a long period of time.
Something that is immutable is always the same and cannot be changed.
If you are impervious to things, such as someone's actions or words, you are not affected by them or do not notice them.
If you say that someone does something with impunity, you dislike the fact that they are not being punished for doing something illegal.
If someone demonstrates impudence, they behave in a very rude or disrespectful way.
If you describe someone as importunate, you think that he is annoying and unreasonable because he keeps trying to get something from you.
If someone is implacable, they very stubbornly react to situations or the opinions of others because of strong feelings that make them unwilling to change their mind.
If someone is impassive, they are not showing any emotion.
If someone is imperturbable, they are always calm and not easily upset or disturbed by any situation, even dangerous ones.
An impregnable opinion or feeling is very difficult to change.
An imprecation is a rude, offensive phrase or word that is said to someone or about someone especially when one is angry.
If you describe someone's appearance or behavior as impeccable, you mean that it is perfect and therefore impossible to criticize.
If someone behaves in an impertinent way, they behave rudely and disrespectfully.
An impasse is a difficult situation in which progress is not possible, usually because none of the people involved are willing to agree.
Something that is immaculate is very clean, pure, or completely free from error.
Something impenetrable cannot be gotten through by any means; for example, an impenetrable problem cannot be understood, and an impenetrable door allows nothing to pass through it.
Something that is imperceptible is either impossible to be perceived by the mind or is very difficult to perceive.
Something that is implausible is unlikely to be true or hard to believe that it's true.
An impromptu speech is unplanned or spontaneous—it has not been practiced in any way beforehand.
When you improvise, you have to make something up with no notice ahead of time since you have been surprised by an unexpected situation that has arisen.
When you act in an imprudent fashion, you do something that is unwise, is lacking in good judgment, or has no forethought.
If something is immobile, it is still, motionless, or incapable of moving.
Something immense is huge, very big, or extremely large.
Someone who is improvident does not think about providing for future events and needs, lacks foresight, and is not cautious or sensible.
Something that happens immediately happens right away or instantly.
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