Impertinence (گستاخی) is a lack of respect; rudeness. It implies an inappropriate 'boldness' (جرات) or forwardness.

An impediment (رکاوٹ) is a hindrance or 'obstruction' (رکاوت) in doing something, such as a speech impediment.

To impede (رکاوٹ ڈالنا) means to delay or prevent someone or something by obstructing them. 'Hinder' (روکنا) is a direct synonym.

Impeccable (بے عیب) means in accordance with the highest standards; 'faultless' (بے نقص) or perfect. 'Dirty' (گندا) is an antonym.

Impaired (خراب) means weakened, damaged, or having a 'defect' (نقص). Vision or hearing can be impaired. 'Enhanced' (بہتر) is an antonym.

Immutable (ناقابل تبدیل) means 'unchangeable' (جو بدلا نہ جا سکے) over time; fixed. 'Variable' (متغیر) is the antonym.

Immunity (قوت مدافعت) is the ability of an organism to resist infection, or 'protection from a disease' (بیماری سے تحفظ). It also means exemption from legal prosecution.

Immobile (ساکن) means not moving or 'motionless' (بے حرکت). 'Active' (فعال) is the antonym.

Imminent (سر پر) means about to happen; threatening to occur soon. It implies something is so close to happening that it feels 'inevitable' (ناگزیر). 'Eminent' (ممتاز) means famous.

Immensity (وسعت) is the extremely large size, scale, or extent of something. 'Enormousness' (عظمت) is a direct synonym. 'Minuteness' (چھوٹا پن) is the antonym.