Lacking in stiffness or firmness
They're cold and flabby, like cabbages, in spite of their prettiness.
His cheeks, which were so flabby that they looked heavier below, were twitching violently; but he wore the air of a man little concerned in what the two ladies were saying.
When attacked by the disease, the larva moves uneasily, stretches itself out lengthwise in the cell, and finally becomes loose and flabby, an appearance which plainly indicates death.
When a wine's acidity is too high, it's flavor is too tart and aggressive, too low and the wine will taste dull, bland and flabby.
When he released him Prince Andrew saw that Kutuzov's flabby lips were trembling and that tears were in his eyes.