Bumble: verb; move or act in an awkward or confused manner (Oxford Dictionary).
Personally, I think it’s a bit sad that the beautiful bumblebee is associated with confusion and awkwardness of movement, though I admit they can seem rather stupid when they fly in the open windows of my apartment and then bump repeatedly against the glass trying to get out again. Most other insects seem able to work out where the open window is.
When it comes to finding nourishment though, they seem perfectly able to home directly in on the next delicious flower. And I’ve recently discovered that the bumblebee wasn’t always so named – it was originally the humblebee, not because it was considered modest or lowly but rather because of the humming sound it makes as it flies along.