involved Synonyms

tortuous convoluted tangled byzantine knotty complex perplexing entangled tricky concerned included thorny preoccupied implicated difficult elaborate embroiled immersed engaged engrossed participating mired active labyrinthine absorbed associated intricate complicated occupied mesmerized problematic profound puzzling meandrous raveled recondite partaking multiple parathetic participative parasynthetic peristaltic operose perplexed opaque necessitated mystifying multiplex related required