Definition of tenacious
1a
: not easily pulled apart : cohesive
a tenacious metal
b
: tending to adhere or cling especially to another substance
tenacious burs
2a
: persistent in maintaining, adhering to, or seeking something valued or desired
a tenacious advocate of civil rights tenacious negotiators
b
: retentive
a tenacious memory
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Merriam-Webster unabridged
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Time Traveler for tenacious
The first known use of tenacious was in 1607
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