on-line vs off-line

on-line and off-line both are adjectives.

Word	Noun	Adjective	Verb	Adverb
on-line	No	Yes	No	No
off-line	No	Yes	No	No

on-line (adjective)	off-line (adjective)
connected to a computer network or accessible by computer	not connected to a computer network
on a regular route of a railroad or bus or airline system	not on a regular route of a transportation system
being in progress now