loose (idea)

1. The opposite of tight: "This bolt is loose."
2. Unrestrained: "The cows are loose in the pasture."
3. Promiscuous: "But the Greek soldiers' wives were at home! How could they possibly have been promiscuous?"

Although you have probably been told countless times to be careful not to "loose" your keys, "loose" has absolutely nothing to do with the verb "to lose".