Flabby (adjective)

1. Lacking firmness or tone; flaccid.
2. Lacking in energy or firmness.

Origin:

Early 17th century: from flabby, a reduced form of flabbiness + -y.

Examples:

1. He had a flabby stomach and needed to exercise.
2. The flabby muscles needed to be toned.
3. The flabby dough wouldn't rise.
4. His handshake was flabby and weak.
5. The flabby performance was due to lack of preparation.