Use tenacious to mean "not easily letting go or giving up," like a clingy child who has a tenacious grip on his mother's hand.

A strong grip or an unyielding advocate might both be described as tenacious, a word whose synonyms include resolute, firm, and persistent. The word comes from the Latin root tenax, which means "holding fast." The basketball commentator Marv Albert, impressed by a defender's skill, once uttered the sound bite, "That's some tenacious D!" ("D" is short for "defense.") The musicians Jack Black and Kyle Gass borrowed the phrase for the name of their comedy-rock band, Tenacious D.

Definitions of tenacious
  1. adjective
    stubbornly unyielding
    “"a mind not gifted to discover truth but tenacious to hold it"- T.S.Eliot”
    “men tenacious of opinion”
    synonyms: dogged, dour, persistent, pertinacious, unyielding
    obstinate, stubborn, unregenerate
    tenaciously unwilling or marked by tenacious unwillingness to yield
  2. adjective
    sticking together
    tenacious burrs”
    synonyms: coherent
    tending to adhere
  3. adjective
    good at remembering
    tenacious memory”
    synonyms: long, recollective, retentive
    aware, mindful
    bearing in mind; attentive to
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    forgetful, short, unretentive
    (of memory) deficient in retentiveness or range
    forgetful, mindless, unmindful
    not mindful or attentive
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