invaluable

1 Beyond calculable or appraisable value, of extreme and undefinable worth

2 Priceless

3 Having incalculable monetary, intellectual, or spiritual worth

1 You are so invaluable that we wouldn't be able to run this company without you.

2 An invaluable comic book collection.

3 I couldn't ever sell my car, I've done so much to it that it's become invaluable to me.

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