1 (of clothes) not fitting closely to the body: --
Wear comfortable, loose clothing to your exercise class.
2 not tightly controlled, or not exact: --
It's only a loose translation of the poem.
It's a fairly loose adaptation of the novel.
3 having low morals; sexually free: --
a loose woman
4 to speak or express emotions very freely, especially in an uncontrolled way: --
His latest movie is a loose adaptation of King Lear.
I can do you a loose translation.
It's a loose equivalent of the French version.
I can give you a loose figure.