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insider trading the often illegal buying or selling of company stock based on information that is not made public.
inside track the shorter inside path on a curved racetrack. [2 definitions]
insidious dangerous through cunning, subtlety, and underhandedness. [2 definitions]
insight the power of mind to grasp an essential meaning or truth. [2 definitions]
insightful keenly perceptive.
insignia a badge, button, emblem, or the like that indicates membership in a certain group. [2 definitions]
insignificant having no value, importance, or significance; trivial. [3 definitions]
insincere exhibiting false or dishonest feelings or opinions; hypocritical.
insincerity the quality of being insincere; deceitfulness or hypocrisy. [2 definitions]
insinuate to suggest (something derogatory) subtly and indirectly. [4 definitions]
insinuation a sly hint or suggestion, esp. a derogatory or malicious one. [2 definitions]
insipid not interesting; dull. [2 definitions]
insist to be firm and unyielding about something. [4 definitions]
insistence the fact of insisting or quality of being insistent.
insistent firm in requesting, demanding, or asserting; unyielding. [3 definitions]
in situ (Latin) in its original place.
insobriety lack of sobriety or moderation; intemperance.
insofar to the extent that (usu. fol. by as).
in so far as to the extent that.
insolate to treat by exposing to sunlight, as for drying or bleaching.
insolation exposure to sunlight, as for drying, bleaching, or other treatment. [3 definitions]