Slack. limp, drooping.

Flaccid in reference to the penis means in the 'relaxed' state, not erect due to sexual or other excitement or stimuli (hanging, not 'standing up')

Loose, baggy, inactive, supine, limp, flaccid, flabby, lazy, negligent, lethargic, careless, excess, leeway...

There are 39 synonyms for limp. A few synonyms are listless, flabby, lax, languid, worn out, slack , spent, tired, weakened, weary, yielding, floppy, and flimsy.

1. If a plant is flaccid, it's weak, lax and soft. If it's turgid, it's distended or swollen, especially due to high fluid content.