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Webster 1913 Edition

Adj.

Like a rig or wanton.

[Obs.]

“Riggish and unmaidenly.”

Bp. Hall.

Adj.

Wanton; lewd. [Not in use.]

riggish ‎(comparative more riggish, superlative most riggish)

(archaic) Like a rig or romp; wanton; lewd.
Riggish and unmaidenly. — Bishop Hall.
- 2008, Sandra Gulland, Mistress of the Sun: A Novel - Page 126:
  “The matchmaker agrees that your having a position at Court will improve your chances, but she warned that you must be exceedingly careful of your reputation. Court society is known to be riggish.”