➖INVALUABLE doesn't mean not valuable, it means extremely useful; it means that something is of a value which cannot be expressed in numbers.

For example: great memories, happiness, health, . They are invaluable, because they cannot be sold or bought.

➖VALUABLE means something is of a high value, such as a valuable diamond. It's valuable, because it costs $10000.

The same thing with "inestimable" ("can't be estimated") and "incalculable" ("can't be calculated"). You can think of "invaluable" as meaning "can't be valued."
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invaluable= priceless =very valuable.
(valueless) is the opposite.

Unfortunately, the prefix "in-" has different meanings which makes it confusing for learners.

inappropriate = not appropriate
invaluable – very valuable
inconceivable – not conceivable
inflammable – very flammable

Take care,

English is weird: Noses run and feet smell.

“Singed” is NOT the past tense of “sing.” 🎤

It’s the past tense of “singe” [sinj]: to burn lightly.

*⃣Tax rates are expected to be increasing next year.
*⃣Tax rates are expected to increase next year.

The infinitive "to increase" is strong and direct, but the progressive infinitive "to be increasing" is weaker and indirect.

cheat (at ) something usually a game
cheat at card
cheat at chess

cheat (on) somebody ===> The man cheated on his lovely wife.
cheat (in ) something===> He had cheated in the test by using a calculator.

APPRAISE = to estimate an item’s value

APPRISE = to inform

Please *apprise* me of my car’s value after you *appraise* it.

👨💬 🤑🚙💵