ruminating russian

• пережёвывающий

  chewing, ruminating, masticating

• обса́сывающий

  sucking (all over), gnawing (a bone), nibbling clean

  dwelling on (details), rehashing, ruminating over

• пережёвывавший

  chewing, masticating, that was chewing

  ruminating on, rehashing, mulling over, that was pondering