Someone who is flighty changes their mind constantly, has trouble focusing, or doesn't follow through on commitments. A flighty person might be wildly excited about joining the chess club on Monday, completely forget about it by Wednesday, and decide by Friday they'd rather learn the violin instead.

The word describes people who flutter from one idea to the next like a butterfly in a garden, never quite landing anywhere long enough to see things through. Flighty people are unreliable and easily distracted, shifting their attention whenever something new catches their eye. A flighty friend might make plans to meet you at the park, then cancel at the last minute because something else caught their attention.

While everyone changes their mind sometimes, being flighty means making this a pattern. It can frustrate people who rely on you, since they never quite know if you'll actually show up or stick with what you promised. The word can also describe someone who's easily distracted or who lives too much in the moment to think about consequences.

Teachers sometimes describe flighty students as having their “head in the clouds,” always daydreaming instead of focusing on the work at hand.