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Antonyms for Loose (opposite meaning)

WordNet sense 1 (deprive of freedom; take into confinement):
confine

WordNet sense 2 (closely constrained or constricted or constricting):
tight

WordNet sense 3 (closely and firmly united or packed together):
compact, compact

WordNet sense 4 (make stiff or stiffer):
stiffen

WordNet sense 5 (firmly attached):
affixed


From the ODE community, based on WordNetadd/edit