Synonyms to just be

stagnate, be a sideliner, be still, coast, constipate, decay, decline, decompose, degenerate, delay, deteriorate, do nothing, drift, fust, go to pot, go to seed, hang fire, hibernate, idle, languish, lie dormant, merely exist, moulder, not budge, not stir, pass the time, rest, rot, rust, sit back, sit it out, sleep, slumber, smolder, spoil, stifle, trammel, vegetate, wait and see, watch and wait, blossom, brew, bud, burgeon, burst forth, develop, flourish, gather, gemmate, germinate, grow, grow rank, grow up, hypertrophy, increase, leaf, leaf out, leave, luxuriate, mature, mushroom, outgrow, overdevelop, overgrow, overrun, overtop, procreate, pullulate, put forth, put forth leaves, put out buds, reproduce, riot, root, shoot, shoot up, spring up, sprout, sprout up, strike root, take root, thrive, tower, upshoot, upspear, upspring, upsprout,