occasional vs casual

occasional and casual both are adjectives.

Word	Noun	Adjective	Verb	Adverb
occasional	No	Yes	No	No
casual	No	Yes	No	No

As adjectives, occasional and casual are synonyms defined as:

occasional (adjective)	casual (adjective)
occurring from time to time	hasty and without attention to detail; not thorough
occurring on a temporary or irregular basis	not showing effort or strain
recurring or reappearing from time to time	occurring on a temporary or irregular basis
occurring or appearing at usually irregular intervals	marked by blithe unconcern
	appropriate for ordinary or routine occasions
	occurring or appearing or singled out by chance
	natural and unstudied
	characterized by a feeling of irresponsibility
	without or seeming to be without plan or method; offhand