Adjectives

(s)cherished, precious, treasured, wantedcharacterized by feeling or showing fond affection for“a cherished friend”, “children are precious”, “a treasured heirloom”, “so good to feel wanted”
(s)preciousof high worth or cost“diamonds, sapphires, rubies, and emeralds are precious stones”
(s)valued, preciousheld in great esteem for admirable qualities especially of an intrinsic nature“a valued friend”, “precious memories”
(s)cute, preciousobviously contrived to charm“an insufferably precious performance”, “a child with intolerably cute mannerisms”

Adverbs

(r)precious, preciouslyvery“there is precious little time left”