used

adjectives

employed in accomplishing something
"the principle of surprise is the most used and misused of all the principles of war"- H.H.Arnold & I.C.Eaker
used
antonym
misused
is similar to
currently being used
"robots are in use throughout industry"
in use
is similar to
put to use
utilised, utilized
of persons; taken advantage of
"after going out of his way to help his friend get the job he felt not appreciated but used"
exploited, ill-used, put-upon, used, victimised, victimized
previously used or owned by another
"bought a secondhand (or used) car"
secondhand, used