Incompatible (ناموافق) means unable to exist or work together. If two things are incompatible, one (or both) can be seen as 'faulty' (ناقص) in the context of the relationship. (Note: This is a weak synonym choice by the question, but the intended answer).

To be incognito (بھیس بدلے ہوئے) means having one's true identity concealed, often by being 'disguised' (روپوش).

Incitement (اشتعال انگیزی) is the action of provoking unlawful or violent behavior. 'Instigation' (اکساہٹ) is a direct synonym. 'Discouragement' (حوصلہ شکنی) is an antonym.

An incentive (ترغیب) is a thing that motivates or encourages one to do something. It is a form of 'stimulation' (تحریک). A 'goad' (اکسانا) is similar but more forceful.

As a verb, to incense (غصہ دلانا) means to make someone very angry or 'enraged' (غضبناک کرنا). As a noun, it is a substance burned for its sweet smell.

Incendiary (آگ لگانے والا) means designed 'to cause fire' (آگ بھڑکانے والا). It can also mean tending to stir up conflict.

To inaugurate (افتتاح کرنا) means to 'begin' (شروع کرنا) or introduce a system, policy, or period. The 'opening ceremony' (افتتاحی تقریب) is the event where this happens.

Inanimate (بے جان) means not alive; 'nonliving' (غیر جاندار). 'Animate' (جاندار) is the antonym.

Inane (احمقانہ) means lacking sense or meaning; silly or 'senseless' (بے معنی). 'Lifeless' (بے جان) is 'inanimate'.

Inadequate (ناکافی) means lacking in quality or quantity. 'Insufficient' (ناپورا) is a direct synonym. 'Enough' (کافی) is the antonym.