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One word that fits your criteria is "distant." It starts with the letter 'd,' ends with 't,' and contains seven letters.
antidisestablishmentarisms Alphabet - 26 letters, starts with A
The word you are looking for is "priceless." It is seven letters long, and its value is immeasurable or beyond price, which aligns with the idea of being "valued" in a profound way.
seven
Couch
Darshan and duramen are the seven letters word that start with D and end with N.
How can the word be 3 letters long if "sand" alone is 4? .
It's not seven but eight letters: republic.
The word is contain.
contain
scallop
Dragnets.
Daffodill
Flank
subtext
Oust.
diligent