surreptitious

adj 0.793

covert

adj 0.760

secretive

adj 0.734

undercover

adj 0.715

cloak-and-dagger

adj 0.689

secret

adj 0.685

sub rosa

adj 0.677

top-secret

adj 0.676

stealth

adj 0.676

top secret

adj 0.675

underhanded

adj 0.668

hush-hush

adj 0.663

stealthy

adj 0.662

conspiratorial

adj 0.659

classified

adj 0.658

occult

adj 0.657

confidential

adj 0.655

furtive

adj 0.650

hidden

adj 0.646

incognito

adj 0.646

cloaked

adj 0.643

sneaky

adj 0.642

undisclosed

adj 0.640

under cover

adj 0.635

cryptic

adj 0.628

concealable

adj 0.624

underhand

adj 0.623

sneaking

adj 0.621

illicit

adj 0.618

underground

adj 0.612

unpublicized

adj 0.611

sneak

adj 0.609

steganographic

adj 0.607

closeted

adj 0.602

secluded

adj 0.602

recondite

adj 0.601

obscure

adj 0.600

discreet

adj 0.595

shadowy

adj 0.592

occulted

adj 0.592

subterraneous

adj 0.592

seclusive

adj 0.591

black-market

adj 0.591

unhidden

adj 0.588

mysterious

adj 0.584

hidden in plain sight

adj 0.584

nonpublic

adj 0.581

nonclassified

adj 0.579

cloistral

adj 0.578

disguised

adj 0.577

hugger-mugger

adj 0.576

encrypted

adj 0.572

subterranean

adj 0.571

esoteric

adj 0.569

undocumented

adj 0.566

unconcealed

adj 0.566

subversive

adj 0.566

unclassified

adj 0.563

arcane

adj 0.563

hided

adj 0.562

hideaway

adj 0.561

veiled

adj 0.561

reclusive

adj 0.560

tacit

adj 0.559

guerrilla

adj 0.559

invisible

adj 0.559

subliminal

adj 0.558

devious

adj 0.558

unseen

adj 0.557

unadvertised

adj 0.557

camouflaged

adj 0.556

obscured

adj 0.556

obfuscated

adj 0.555

cagey

adj 0.554

conniving

adj 0.552

enigmatic

adj 0.552

plainclothes

adj 0.551

cryptogenic

adj 0.550

obscurant

adj 0.549

unrevealed

adj 0.549

shrouded

adj 0.548

private

adj 0.548

sequestered

adj 0.548

unlisted

adj 0.548

shady

adj 0.547

nonprivate

adj 0.546

terranean

adj 0.546

collusive

adj 0.545

contraband

adj 0.545

nontransparent

adj 0.544

illegal

adj 0.543

undetected

adj 0.543

unannounced

adj 0.542

evasive

adj 0.541

inconspicuous

adj 0.540

cryptographic

adj 0.539

unspoken

adj 0.538

undivulged

adj 0.538

closet

adj 0.537

untraceable

adj 0.536