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superhard
superhard adj. 
/ˌsjuːpəˈhɑːd/,
Brit. /ˌsuːpəˈhɑːd/
, /ˌsuːpəˈhɑːd//ˌsjuːpəˈhɑːd/U.S. /ˌsupərˈhɑrd/
(a) (of a material) extremely hard; (b) very difficult./ˌsupərˈhɑrd/ΚΠ
1904 Michigan Alumnus Feb. (Advertiser section) 21 (advt.) The best Moulded Records are not only gold-moulded; they are super-hard.
1938 Pop. Sci. Dec. 84/1 Ice-boat owners are getting more speed..by coating the steel runners with a modern, super-hard alloy.
1953 N.Y. Times 18 Oct. 18/3 (advt.) Plextone-finish..is superhard to crack, chip or peel.
1974 Alcalde (Univ. Texas) Mar. 31/3 One night after I returned from a super hard calculus final and was pretty down, I had a little impromptu party with some of my friends.
2004 U.S. Black Engineer & Information Technol. Nov. 28/2 She participated in research on nitride superlattice thin films for superhard coatings to be used for cutting tools.
2010 A. Calhoun Instinctive Parenting 54 Just try really hard to be nice and generous even though it's superhard to not feel overwhelmed.
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as lemmas
- high-couraged
- high-crested
- high-cristobalite
- high-crowned
- high-current
- high-cut
- high-day noon
- high-definition
- high-density
- high-density lipoprotein
- high-descended
- high-dollar
- high-domed
- high-dose
- high-dressed
- high-dried
- high-dried irish
- high-dudgeoned
- high-duty
- high-efficiency
- high-end
- high-energy
- high-famed
- high-fat
- high-featured