Utmost
Part of speech: noun
Definition: maximum; greatest possible amount or quantity.
Part of speech: adjective
Definition: Situated at the most distant limit; farthest The most extreme; ultimate; greatest
Example sentence: In love, as in gluttony, pleasure is a matter of the utmost precision.
Extreme
Part of speech: adjective
Definition: Of a place, the most remote, farthest or outermost.In the greatest or highest degree; intense.Excessive, or far beyond the norm.Drastic, or of great severity.Of sports, difficult or dangerous; performed in a hazardous environment.Ultimate, final or last.
Part of speech: noun
Definition: The greatest or utmost point, degree or conditionEach of the things at opposite ends of a range or scale.A drastic expedient.Either of the two numbers at the ends of a proportion, as 1 and 6 in 1:2=3:6.
Example sentence: Much literary criticism comes from people for whom extreme specialization is a cover for either grave cerebral inadequacy or terminal laziness, the latter being a much cherished aspect of academic freedom.