UK forces have been in Afghanistan since US-led forces launched Operation Enduring Freedom in 2001, targeting al-Qaeda and its Taliban supporters.
5. Weak in intellect; destitute of ordinary strength of mind; foolish; witless; simple; as, a silly woman. 6. Proceeding from want of understanding or common judgment; characterized by weakness or folly; unwise; absurd; stupid; as, silly conduct; a silly question.
Given that, in modern usage, giddy describes someone silly and frivolous, it's interesting to know that the Old English source for this word has a slightly darker tinge: gidig means insane or god-possessed..