The opposite state from loose (fitting) would be tight, or secure.
The opposite of loose (free) would be captive, controlled, contained, or corraled.
The opposite could be tightly, firmly, or securely.
The opposite of looser (less loose) could be tighter, or stricter.
loose, or open "that jar isn't tight enough, its loose." or "he had a tight grip, but her hand had a loose grip."
Something fancy and loose.
loose limp
A bimbo is a ditzy woman who has loose morals. The opposite would be a lady.
You misspelled the word "lose." "Loose" is the opposite of "tight."
inadhesive, loose, open
Non-technical, general, loose
The opposite of strict can be lenient, flexible, or relaxed.
Antonyms of confinement are: free, release, loose, open, unbind, unfasten, and allow.
An antonym or opposite for tight would be loose. You could also say flimsy or flexible.
If you turn it to the right it gets tighter and if you turn it to the left it gets loser