adj. tenacious, not easily loosened; stubborn, obstinate

n. forceps, instrument used to hold firmly or remove

(adj.) = vigorous ; strong-willed ; unremitting ; tough-minded ; dauntless ; tenacious ; stubborn.
Ex: Students would be in the environment of a vigorous library service which emphasised its information function.
Ex: The image which the majority of girls have of the sports woman is as of a healthy, slim, clean, quick-moving, intelligent, strong-willed, self-assured & natural person.
Ex: This unremitting castigation of the Nazi masks both the historical complicity of the United States with Nazi crimes and our own racist and genocidal histories.
Ex: Carnegie was a conservative, rigidly moralistic, and tough-minded individualist.
Ex: He was a dauntless adventurer, a sleuthhound, a research scholar of exceptional acuity.
Ex: She's tough and tenacious and she still has almost as many enemies as she has friends.
Ex: He is seldom happy, never satisfied, temperamental, stubborn; his behavior at times can be charitably characterized as erratic.