Immaculate (بے داغ) means perfectly clean, neat, or tidy; free from all 'flaws' (نقص). 'Flawless' (بے عیب) is a direct synonym. 'Contaminated' (آلودہ) is an antonym.

Illustrious (نامور) means well known, respected, and admired for past achievements. 'Brilliant' (شاندار) or distinguished is a synonym. 'Inglorious' (شرمناک) is an antonym.

Illusive (فریب دہ) (related to 'illusion') means deceptive or 'not real' (غیر حقیقی). It is often confused with 'elusive' (گریزاں), which means hard to catch.

An illusion (فریب نظر) is a false idea or belief, or something that deceives the senses. It is a 'misconception or delusion' (غلط فہمی یا دھوکہ).

Illicit (غیر قانونی) means forbidden by law, rules, or custom. 'Unlawful' (ناجائز) is a direct synonym. 'Illiterate' (ناخواندہ) means unable to read.

Illegible (ناقابل خواندگی) means not clear enough to be read, such as bad handwriting. 'Indistinct' (غیر واضح) is the best synonym. 'Clear' (واضح) is the antonym.

Ignorant (جاہل) means lacking knowledge, awareness, or information. 'Clueless' (بے خبر) is a common synonym. 'Wise' (عقلمند) is the antonym.

Ignominious (شرمناک) means deserving or causing public shame or 'disgrace' (ذلت). 'Triumphant' (فاتح) is an antonym.

An idealist (مثالیت پسند) is a 'person having high standards' (اعلیٰ معیار رکھنے والا شخص) or noble principles, often seen as impractical.

Hypothetical (فرضی) means based on a proposed idea or situation rather than fact. It is 'imaginary' (خیالی) or supposed. 'Actual' (حقیقی) is the antonym.