Simple past tense and past participle of ruin.(verb)
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Use "ruined" in a sentence
"Alan took a chip in the neck and it opened up a small cut that nevertheless bled copiously and ruined, * ruined* his favorite T-shirt, with Snoopy sitting atop his doghouse in an aviator's helmet, firing an imaginary machine gun at the cursed Red Baron."
"Badly chosen baby names can lead to low self-esteem, low education and more smoking: study Most people would rather be single than date someone with an 'unfortunate' name, research shows Amanda Mikelberg / NEW YORK DAILY NEWS Think your name ruined your life?"
"He was innocent of the first problem; the rain ruined their scheduled activities at the new park, a square block of reclaimed grassland from the surrounding urban waste."