=
KEY: Aptitude.
SYN: Fitness, liability, susceptibility, suitableness, readiness, quickness, cleverness, proneness, tendency.
ANT: Unfitness, unsuitableness, insusceptibility, slowness, stupidity, unreadiness, awkwardness.
=
KEY: Arbiter.
SYN: Arbitrator, judge, umpire, moderator, director, referee, adjudicator.
ANT: Appellant, claimant, disputant, litigant.
=
KEY: Arbitrary.