ponderously

/ˈpɑndərəsli/
adverb
  1. In a slow, heavy, and clumsy way because of great weight or size.
    • She walked ponderously up the stairs, each step a great effort.
    • The bear moved ponderously through the thick snow.
    • The old man rose ponderously from his chair, gripping the armrests.
  2. In a dull, slow, or boring manner.
    • The novel begins ponderously, with pages of detailed description.
    • He answered each question ponderously, as if weighing every word.
    • The speaker droned on ponderously, losing the audience's attention.