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tough nut

see hard nut to crack.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for tough nut

sensible, pragmatic, shrewd, headstrong, practical, obstinate, rational, sober, hard-nosed, astute, unsentimental, unmanageable, stubborn, intransigent, uncompromising, incurable, tenacious, unshakable, steadfast, indefatigable