1) At full capacity 2) Bursting at the seams 3) Busy 4) Crammed 5) Densely inhabited 6) Filled 7) Filled to excess 8) Full 9) Full of people 10) Full to capacity 11) Full to overflowing 12) Heavily populated 13) Heaving 14) Huddled 15) Jam-packed 16) Jam-pawncked 17) Jammed 18) Overcrowded 19) Packed Found on https://www.crosswordclues.com/clue/crowded
adjective overfilled or compacted or concentrated; `a crowded theater`; `a crowded program`; `crowded trains`; `a young mother`s crowded days` Found on https://www.encyclo.co.uk/local/20974
filled to excess; packed. · filled with a crowd: crowded streets. · uncomfortably close together: crowded passengers on a bus. Found on https://www.infoplease.com/dictionary/crowded