| impavid(strong, tough, bold, spirited, brave) |
| impertinent(adjective, mad, bold, naughty, impudent) |
| impudent(adjective, mad, bold, naughty) |
| indomitable(strong, tough, noble, bold, spirited) |
| industrious(adjective, energetic, daring, resourceful, innovative) |
| insuppressible(careless, thoughtless, impulsive, reckless, hasty) |
| irrational(careless, thoughtless, impulsive, reckless, hasty) |
| irresponsible(adjective, careless, wild, bold, thoughtless) |
| irreverent(adjective, mad, bold, naughty, impudent) |
| itching(adjective, energetic, daring, resourceful, innovative) |
| jeopardizing |
| jumping to conclusions(expression, idiom, careless, thoughtless, impulsive) |
| lionhearted(strong, tough, bold, spirited, brave) |
| lippy(adjective, mad, bold, naughty, impudent) |
| lively(adjective, energetic, cheerful, jolly, daring) |
| long shot(expression, delicate, uncertain, unsound, treacherous) |
| lusting(adjective, energetic, daring, resourceful, innovative) |
| malapert(adjective, mad, bold, naughty, impudent) |
| martial(strong, tough, bold, spirited, brave) |
| mettled(noun, adjective) |