Why does the prefix in- sometimes make a synonym rather than an antonym? In the case of invaluable, the prefix is still a negation, since it suggests that something’s value is incalculable. Michael Quinion‘s website affixes.org shows how in- prefixes have changed over time. This is part of a complete episode.
More from this show
According to Gobsmacked: The British Invasion of American English (Bookshop|Amazon) by Ben Yagoda, the word smarmy, meaning “unctuous” or “ingratiating,” may come from a 19th-century magazine contest, in which readers sent in...
Mary Beth in Greenville, South Carolina, wonders: Why do we say four-oh-nine for the number 409 instead of four-zero-nine or four-aught-nine? What are the rules for saying either zero or oh or aught or ought to indicate that arithmetical symbol...