The word "loosenesses" implies a lack of firmness or tightness, and therefore its antonyms are words that connote the opposite. The first antonym that comes to mind is "tightness," which represents a state of being compressed or constricted. Another antonym can be "rigidity," which signifies a rigid, unyielding state. Then there is "stiffness," which refers to a lack of flexibility, instead being hard or brittle. Finally, there is "tenseness," which represents a state of being able to stretch or extend but stays firm at the same time. In summary, the antonyms for "loosenesses" are tightness, rigidity, stiffness, and tenseness.