coincidental

As adjectives the difference between coincidental and concurrent

is that coincidental is occurring as or resulting from coincidence while concurrent is happening at the same time; simultaneous.

As a noun concurrent is

one who, or that which, concurs; a joint or contributory cause.

As adjectives the difference between casual and coincidental

is that casual is happening by chance while coincidental is occurring as or resulting from coincidence.

As a noun casual

is a worker who is only working for a company occasionally, not as its permanent employee.

As adjectives the difference between coincidental and circumstantial

is that coincidental is occurring as or resulting from coincidence while circumstantial is pertaining to or dependent on circumstances, especially as opposed to essentials; incidental, not essential.

As a noun circumstantial is

something incidental to the main subject, but of less importance.

As an adjective coincidental

is occurring as or resulting from coincidence.

As an adverb coincidently is

simultaneously; at the same time.

As an adjective coincidental is

occurring as or resulting from coincidence.

Coincidental is a synonym of concomitant.

As adjectives the difference between coincidental and concomitant

is that coincidental is occurring as or resulting from coincidence while concomitant is accompanying; conjoined; attending; concurrent.

As a noun concomitant is

something happening or existing at the same time.

As adjectives the difference between unintentional and coincidental

is that unintentional is not intended or deliberate; inadvertent; unwitting while coincidental is occurring as or resulting from coincidence.

As adjectives the difference between coincidental and unplanned

is that coincidental is occurring as or resulting from coincidence while unplanned is unintentional; not intended.

As adjectives the difference between coherent and coincidental

is that coherent is coherent while coincidental is occurring as or resulting from coincidence.

As adjectives the difference between coincidental and analog

is that coincidental is occurring as or resulting from coincidence while analog is analogue (being represented by a continuously variable physical quantity).