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Webster 1913 Edition

adv.

In a chaste manner; with purity.

adv.

In a chaste manner; without unlawful commerce of sexes; without obscenity; purely; without barbarisms or unnatural phrases.

chastely ‎(comparative more chastely, superlative most chastely)

In a chaste manner. (either specifically virginal, or in a modest, unsexy and unrisque manner)
- 1808 Allan Ramsay - The gentle shepher
  Let lasses of a silly mind / Refuse what maist they're wanting / Since we for yielding were designed / We chastely should be granting.
- 2004 Theo Clemens, Wim Janse - The Pastor Bonus
  In holy orders no one is better loved than he who lives chastely, because chastity is the first principle for any cleric as well as the foundation of his life.

in a chaste manner