understudied

/AH1 N D ER0 S T AH0 D IY0 D/
adjective
  1. 1

    Insufficiently studied.

verb
  1. 1

    To study or know a role to such an extent as to be able to replace the normal performer when required.

  2. 2

    To act as an understudy (to someone).

  3. 3

    To act in a similar manner to some known person.

Source: https://en.wiktionary.org/wiki/understudied