toughie

noun 0.703

tough case

noun 0.701

tough

noun 0.677

tough call

noun 0.621

hard out

noun 0.613

tough luck

noun 0.606

hard head

noun 0.597

bitter pill to swallow

noun 0.586

uphill battle

noun 0.563

sticky wicket

noun 0.562

toughness

noun 0.562

cracking

noun 0.560

nut

noun 0.560

no mean feat

noun 0.559

hard act to follow

noun 0.558

hard g

noun 0.556

hard

noun 0.555

hard war

noun 0.555

hardhead

noun 0.554

needle in a haystack

noun 0.554

nut job

noun 0.552

tough act to follow

noun 0.548

stubborn

noun 0.548

crack

noun 0.547

tall order

noun 0.544

hard luck

noun 0.542

hard c

noun 0.542

hardball

noun 0.540

pain in the butt

noun 0.538

nutcracker

noun 0.537

crackpot

noun 0.535

diamond in the rough

noun 0.534

spanner in the works

noun 0.530

hard food

noun 0.529

pain in the arse

noun 0.525

jawbreaker

noun 0.525

crack shot

noun 0.523

problem child

noun 0.522

nutter

noun 0.521

wrench in the works

noun 0.517

crackerjack

noun 0.517

brick wall

noun 0.515

bad egg

noun 0.515

puzzler

noun 0.514

stumper

noun 0.513

bad apple

noun 0.513

brainteaser

noun 0.513

head case

noun 0.511

hard sell

noun 0.509

cracker

noun 0.509

inscrutable

noun 0.507

mountain to climb

noun 0.506

difficulty

noun 0.506

unbreakable

noun 0.506

heartbreaker

noun 0.505

in difficulties

noun 0.504

hard drug

noun 0.502

roughneck

noun 0.502

hardman

noun 0.502

impenetrable

noun 0.502

stiff upper lip

noun 0.501

loose cannon

noun 0.501