to incinerate	to destroy unwanted things by burning
inconsiderate	that don't care how their behaviour affect others
indigestion	a pain that you get when you find difficult to digest food
inebriated	drunk
initially	at the beginning, at first
to inoculate	to vaccinate
insolvent	not having money to pay what one owes
insipid	having very little taste
invulnerable	that cannot be harmed or damaged
to inaugurate	to introduce sb into sth by holding a special ceremony
incompatible	unable to exist together because of being completely different
to indict	to charge sb formally with an offence in law
to infuriate	to make sb very angry
inquest	an official inquiry to find out what caused sb's death
insulent	rude, impolite
innovation	the introduction of a new idea, method, invention
indispensible	absolutely essential
incognito	in disguise, using another name so that he won't be recognised
insatiable	that cannot be satisfied
incredulity	disbelief
incense	a substance that is burned in church
inlet	a narrow bay
incentive	sth that encourages you to do sth
innate	that you were born with
incorrigible	that cannot be changed