This monograph investigates a number of central issues in the Syntax of Adverbs with special reference to Greek in the light of Kayne's (1994) Antisymmetry Hypothesis. It examines the conditions on the placement of the various adverb types, their licensing requirements, and their relation to adjectives. The author advances an analysis according to which adverbs are licensed as Specifiers of functional projections in the clausal domain. As such, they enter a matching relation with the relevant features of the respective functional head. Adverbs are either directly merged at the relevant functional projection (for instance Aspectual and Speaker Oriented adverbs) or alternatively they are moved to this position from the complement domain of the verb (for instance manner adverbs). Furthermore, the volume examines the phenomenon of Adverb Incorporation. It is proposed that Incorporation is obligatory for those VP internal Adverbs which are 'structuraly non-complex' in Chomsky's 1995 terms. Finally, the similarities and differences between adverbs and adjectives, clausal and nominal structure are investigated and a number of asymmetries between the two are highlighted.