UNDERSTUDIED
UNDERSTUDY
understudy, alternate
(verb) be an understudy or alternate for a role
Source: WordNet® 3.1
Etymology 1
Adjective
understudied (comparative more understudied, superlative most understudied)
Insufficiently studied.
Etymology 2
Verb
understudied
simple past tense and past participle of understudy
Source: Wiktionary
UNDERSTUDY
Un"der*stud`y, v. t. & i. (Theater)
Definition: To study, as another actor's part, in order to be his
substitute in an emergency; to study another actor's part.
Un"der*stud`y, n.
Definition: One who studies another's part with a view to assuming it in an
emergency.
Source: Webster’s Unabridged Dictionary 1913 Edition