1. without checks or restraints; uncontrolled or unrestrained
Usage: formal or literary
2. having no checks or checkered pattern
Usage: less common

Examples

• The checkless expansion of the empire eventually led to its downfall.
• His checkless ambition drove him to take increasingly risky decisions.
• The river flowed with checkless force after the dam broke.
• She wore a checkless blue dress to the formal dinner.
• Without proper oversight, the project proceeded in a checkless manner.
• The checkless growth of the city created infrastructure problems.