1.
If you describe someone as ~, you mean they behave in a silly or light-hearted way, rather than being serious and sensible.
I just decided I was a bit too ~ to be a doctor...
ADJ
2.
If you describe an activity as ~, you disapprove of it because it is not useful and wastes time or money.
The group says it wants politicians to stop wasting public money on what it believes are ~ projects.
ADJ disapproval