Artificial intelligent assistant

lumbrous

lumbrous, a. rare.
  (ˈlʌmbrəs)
  [f. lumber n.1 + -ous.]
  Heavy and unwieldly; lumbering.

1836 J. Hildreth Dragoon Campaigns Rocky Mts. i. iii. 26 Our lumbrous vessel heavily groped her way through the waters. 1847–8 H. Miller First Impr. xi. (1857) 170 The lumbrous dignity of Shenstone's elegiacs. 1887 Hall Caine Deemster ii. (1888), A lumbrous, jolting sound of heavy wheels.

Oxford English Dictionary

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