nothing to sneeze at

noun 0.598

tall order

noun 0.586

hard act to follow

noun 0.561

tough nut to crack

noun 0.559

tough act to follow

noun 0.544

tour de force

noun 0.542

mission impossible

noun 0.524

big deal

noun 0.521

feat of strength

noun 0.511

achievement

noun 0.509

uphill battle

noun 0.501