1. most changeable in mood or behavior; most unreliable or irresponsible
Usage: superlative form of flighty

Examples

• She was the flightiest member of the group, always changing her mind about plans.
• Of all my friends, Sarah is the flightiest when it comes to keeping commitments.
• The flightiest students often struggle with long-term projects.
• He proved to be the flightiest employee, jumping from task to task without finishing anything.
• Among the three sisters, Emma was considered the flightiest and most unpredictable.
• The flightiest birds in the flock were the first to abandon the feeding area.