(of accommodations or a space) filled beyond what is comfortable, safe, or desirable.
‘infectious diseases can spread in overcrowded prisons’
‘the train was seriously overcrowded’
overfull, overflowing, full to bursting, full to overflowing, crammed full, cram-full, jammed, packed like sardines, congested, choked, overloaded, overpopulated, overpeopled, overrun, crowded, thronged, swarming, teeming