Compound adjectives

1. A compound adjective is an adjective that contains two or more words. In general, we use a hyphen when the compound adjective comes before the noun it modifies, but not when it comes after the noun:
1. This is a world-famous museum
2. This museum is world famous
2. Compound adjectives can be formed with numbers: three-second, ten-minute, two-hour, five-day, six-week, three-month, two-year, four-year-old, twelve-story, twenty-page
3. We don’t use '-s' at the end of compound adjectives with numbers:
1. Let’s take a ten-minute break (correct)
2. Let’s take a ten-minutes break (incorrect)
4. Compound adjectives can also be formed with...
1. ...an adjective/adverb + past participle: narrow-minded, well-behaved, old-fashioned, densely-populated, short-haired, widely-recognized, high-spirited, well-educated, highly-respected, brightly-lit, absent-minded, strong-willed, quick-witted, middle-aged, kind-hearted
2. ...adjective/adverb/noun + present participle with '-ing': good-looking, long-lasting, record-breaking, never-ending, mouth-watering, thought-provoking, slow-moving, far-reaching, time-saving, forward-thinking
5. Other common compound adjectives are: ice-cold, last-minute, full-length, world-famous, fat-free