Holding fast, or inclined to hold fast; inclined to retain what is in possession: with of before the thing held; hence, stubborn; obstinate.Retentive; apt to retain long what is committed to it: said of the memory.Niggardly; close-fisted.Apt to adhere to another substance; adhesive, as ropy, glutinous, or viscous matter; sticky; viscid: as, few substances are so tenacious as tar.Tough; having great cohesive force between its particles, so that they resist any effort to pull or force them asunder: as, steel is the most tenacious of all known substances.