1. Standing or resting on something.
  2. Urgent in dwelling upon anything; persistent in urging or maintaining.
  3. Extorting attention or notice; coercively staring or prominent; vivid; intense.
  4. Standing on end: specifically said of the hind toe of a bird when its base is inserted so high on the shank that only its tip touches the ground: correlated with incumbent.

The above text is a snippet from Wiktionary: insistent
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