General Meaning: "Into," "In," "On," "Toward"
* incorporate: to include something as part of a larger whole
* inscribe: to write or carve words or symbols onto a surface
* indent: to set in from the margin
* infiltrate: to enter or penetrate secretly or gradually
* inhabit: to live in a place
* invade: to enter a country or place by force
* inject: to force a liquid into something
* insert: to put something into something else
* inspire: to fill someone with the urge to do something
Meaning: "Not" or "Opposite of"
* inaccurate: not accurate
* inactive: not active
* incapable: not capable
* incomplete: not complete
* incorrect: not correct
* inconsiderate: not considerate
* indecent: not decent
* ineffective: not effective
* inefficient: not efficient
* inequality: a state of being unequal
* insecure: not secure
* insincere: not sincere
* invisible: not visible
Other Meaning:
* inside: the inner part of something
* income: money earned from work or investments
* inquire: to ask for information
* install: to put something in place and make it ready for use
* influence: to have an effect on someone or something
* initial: the first letter of a word or name
This is just a small sample, and there are many more words using the prefix "in-".