WordReference Random House Learner's Dictionary of American English © 2020
jerk•y1 /ˈdʒɜrki/USA pronunciation   adj.,  -i•er, -i•est. 
  1. having or moving with jerks or sudden starts:In a series of jerky movements the train stopped.
  2. Slang Termssilly;
    foolish:a jerky thing to do.

jer•ky2 /ˈdʒɜrki/USA pronunciation   n. [uncountable]
  1. Foodmeat that has been smoked and dried so that it is hard to chew.

WordReference Random House Unabridged Dictionary of American English © 2020
jerk•y1  ( jûrkē),USA pronunciation adj.,  jerk•i•er, jerk•i•est. 
  1. characterized by jerks or sudden starts;
  2. Slang Termssilly;
jerki•ly, adv. 
jerki•ness, n. 
  • jerk1 + -y1 1855–60

jer•ky2  ( jûrkē),USA pronunciation n. 
  1. Foodmeat, esp. beef, that has been cut in strips and preserved by drying in the sun;
    jerked meat.
Also,  jerk. 
  • alteration of charqui 1840–50, American.

'jerkily' also found in these entries (note: many are not synonyms or translations):

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