Iconoclast (मूर्तिभंजक, मूर्ति तोड़ने वाला ) : One who criticizes popular beliefs which he thinks is mistaken or unwise  

Idiosyncrasy (अनोखापन, पागलपन) : A person’s peculiar habit 

Idolatry (मूर्ति पूजा) : The worship of idols or images 

Illegible (अस्पष्ट, अपठनीय)   : That which cannot be easily read  

Illiterate (निरक्षर) : A man who does not know how to read or write 

Imaginary (काल्पनिक) : Existing only in the mind 

Immigrant (आप्रवासी ) : A person coming to a foreign land to settle there  

Implacable (संगदिल) : Someone who is incapable of being quietened or pacified 

Implicate (फंसाना) : To confirm with the help of evidence 

Imposter (ढोंगी)  : A person who pretends to be what he is not 

Improvident (उड़ाऊ) : One who is too careless to plan for the future 

Impunity (दण्ड मुक्ति) : Without risk of punishment 

Inaccessible (दुर्गम)  : Incapable of being approached  

Inaudible (अश्राव्य)  : A voice that cannot be heard 

Incentive (प्रोत्साहन) : Motive or incitement to action 

Incomprehensible (समझ से बाहर) : Something that is difficult to understand  

Incorrigible (असंशोधनीय)   : One who cannot be corrected 

Incredible (अतुल्य)   : Something which cannot be believed 

Indefatigable (अथक) : Incapable of being tired 

Indelible (अमिट) : That which cannot be effaced 

Indignant (क्रोधित) : Feeling annoyed at the sight of unfair treatment  

Inedible (अखाद्य) : Not suitable for eating 

Ineffable (अकहा) : Impossible to describe  

Ineligible (अनुचित) : Someone not fit to be chosen 

Ineptness (मूर्खता) : Lack of skills 

Inevitable (अपरिहार्य)  : That which cannot be avoided 

Infallible (अचूक)   : A method which never fails 

Infanticide (शिशु हत्या) : Killing of a child 

Inflammatory (भड़काऊ) : Action that is likely to make people very angry 

Inflorescence (फूलना, उन्नति) : A cluster of flowers on a branch  

Inheritance (विरासत) : Property handled down after the death of a person 

Inscribe(लिखना, उत्कीर्ण करना) : Write or carve words on stone or paper  

Insolvent (दिवालिया)  : A person who has no money to pay off his debts 

Insomnia (अनिद्रा)  : Inability to sleep 

Interlude (अन्तराल, मध्यांतर) : Interval between two events 

Intermediary (मध्यस्थ) : One who intervenes between two or more parties to settle differences  

Interment (दफ़न) : The burial of corpse  

Internment (नजरबंदी) : Detaining and confining something 

Intestate (बिना वसीयतनामा के मारा हुआ, निर्वसीयत)  : To die without having made a will 

Introspect (आत्मनिरीक्षण) : The action of looking within or into one’s own mind 

Intruder (घुसेड़नेवाला) : A person who enters without any invitation 

Invertebrates (अकशेरुकी) : Animals without backbone 

Investigation (जाँच पड़ताल) : Careful or thorough enquiry 

Invincible (अजेय) : That which cannot be defeated 

Invocation (मंगलाचरण ) : Call upon God or any other power (like law) for help or protection 

Irrevocable (स्थिर) : That which cannot be called back  

Irrigate (सींचना ) : To supply land with water by artificial means  

Isthmus (स्थलडमरूमध्य) : A narrow stretch of land connecting two large bodies of land 

Itinerant ( भ्रमणकारी, चलनेवाला) : One who journeys from place to place  

Itinerary (यात्रा कार्यक्रम)   : Detailed plan of a journey