facultative

adj 0.767

obligational

adj 0.758

obligatory

adj 0.756

unrequired

adj 0.708

nonessential

adj 0.686

obligate

adj 0.685

obligated

adj 0.667

optional

adj 0.663

nonelective

adj 0.662

omissible

adj 0.660

unessential

adj 0.652

nullable

adj 0.649

voluntary

adj 0.635

elective

adj 0.634

nonrestrictive

adj 0.633

noncommitted

adj 0.632

nondeliberative

adj 0.611

inessential

adj 0.610

dispensable

adj 0.605

nonabsolute

adj 0.600

unrequested

adj 0.596

non-strict

adj 0.595

nonlegal

adj 0.595

waivable

adj 0.591

nonofficial

adj 0.590

obliging

adj 0.589

nonarbitrary

adj 0.587

nonbudgetary

adj 0.586

mandatory

adj 0.586

unnecessary

adj 0.586

unforced

adj 0.586

compulsory

adj 0.584

unbidden

adj 0.583

nonguaranteed

adj 0.581

voluntaristic

adj 0.581

supererogatory

adj 0.580

nondependent

adj 0.579

obliged

adj 0.579

noncritical

adj 0.576

voidable

adj 0.574

nonsubscription

adj 0.574

noncustodial

adj 0.573

noncurricular

adj 0.572

gratuitous

adj 0.571

nondemanding

adj 0.565

nonnegotiable

adj 0.565

skippable

adj 0.562

unneeded

adj 0.561

unrestricted

adj 0.559

nonexempt

adj 0.559

involuntary

adj 0.558

conditional

adj 0.557

nonprescribed

adj 0.557

opt-out

adj 0.556

nonparticipating

adj 0.556

nonduty

adj 0.556

noncontracting

adj 0.556

nonexecutable

adj 0.555

volitional

adj 0.555

nonparticipatory

adj 0.554

nonlimiting

adj 0.553

nondirective

adj 0.552

uncommitted

adj 0.552

arbitrary

adj 0.551

nonchargeable

adj 0.551

nonconstrained

adj 0.549

noncomprehensive

adj 0.548

nonwaiver

adj 0.548

nonpurchase

adj 0.547

nonscheduled

adj 0.547

nonjudicial

adj 0.546

nonfunctional

adj 0.545

unconditional

adj 0.545

nonbasic

adj 0.544

contingent

adj 0.544

nondetachable

adj 0.543

nondeterministic

adj 0.542

unavoidable

adj 0.542

nonassignable

adj 0.542

unspecified

adj 0.541

nonmodal

adj 0.541

unappropriated

adj 0.541

nonmonetary

adj 0.540

non-relative

adj 0.539

nonignorable

adj 0.539

unsolicited

adj 0.538

nonbonding

adj 0.538

unenforced

adj 0.538

unofficial

adj 0.537

nonretirement

adj 0.537

nonsubjective

adj 0.536

nonordained

adj 0.536

quasifree

adj 0.536

unreserved

adj 0.535

nonbeneficial

adj 0.535

nonselective

adj 0.535

nonautonomous

adj 0.534

permissible

adj 0.534

nonprogrammatic

adj 0.534

uncoerced

adj 0.533