casual vs free-and-easy

casual and free-and-easy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
casual	No	Yes	No	No
free-and-easy	No	Yes	No	No

As adjectives, casual and free-and-easy are synonyms defined as:

casual (adjective)	free-and-easy (adjective)
hasty and without attention to detail; not thorough	natural and unstudied
not showing effort or strain
occurring on a temporary or irregular basis
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