Meritorious is the compliment: it means genuinely deserving of praise or reward. Meretricious is closer to an insult: it means flashy and superficially attractive but actually worthless. They look alike and sound alike, but one word praises substance and the other criticises the lack of it.
The core difference
Meritorious describes something that truly deserves credit, while meretricious describes something that only looks impressive but has no real value.
- meritorious — deserving of merit or commendation: She received a meritorious service award for her years of volunteering.
- meretricious — tastelessly showy; superficially attractive but with no real substance: The renovation looked meretricious, all gold trim and no craftsmanship.
How to tell them apart
The confusion is understandable because both words trace back to the Latin verb mereō, meaning to earn or deserve. But they branched in very different directions: meritorious comes via meritus, simply "earned," while meretricious comes via meretrix, "a woman who earns by her charms" — the source of its meaning of hollow, flashy allure.
A memory hook: meritorious has merit sitting right inside it, so it keeps the positive sense. Meretricious is the one to watch for in writing about design, prose style or décor that dazzles on the surface but doesn't hold up.