intensive >> ɪnˈtɛnsɪv
Definition: [adjective] concentrated on a single subject or into a short time; very thorough or vigorous.
Example: she undertook an intensive Arabic course
Definition: [adjective] (of an adjective, adverb, or particle) giving force or emphasis.
Definition: [adjective] denoting a property which is measured in terms of intensity (e.g. concentration) rather than of extent (e.g. volume), and so is not simply increased by addition of one thing to another.
Definition: [noun] an intensive adjective, adverb, or particle; an intensifier.