unstrong

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• unstrong — adjective Not strong; weak …   Wiktionary

• unstrong — adj. O. and N. 561 …   Oldest English Words

• Glass-reinforced plastic — (GRP), is a composite material or fiber reinforced plastic made of a plastic reinforced by fine fibers made of glass. Like graphite reinforced plastic, the composite material is commonly referred to by the name of its reinforcing fibers… …   Wikipedia