This book investigates - mainly on the basis of Hungarian data - the grammar of adverbs and adverbial adjuncts, among them locatives, temporals, comitatives, epistemic adverbs, adverbs of degree, manner, counting, and frequency, quantificational adverbs, and adverbial participles. In the spirit of the Minimalist research program, the analyses focus on the impact of semantic and phonological requirements on adverbial syntax.