unsynchronous vs asynchronous

unsynchronous and asynchronous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unsynchronous	No	Yes	No	No
asynchronous	No	Yes	No	No

unsynchronous (adjective)	asynchronous (adjective)
not occurring together	not synchronous; not occurring or existing at the same time or having the same period or phase
	(digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself