handfastly

English

Etymology

From handfast +‎ -ly.

Adverb

handfastly (comparative more handfastly, superlative most handfastly)

(obsolete) In a handfast manner
- 1577, Raphaell Holinshed, The Firste Volume of the Chronicles of England, Scotlande, and Irelande […], volume I, London: […] [Henry Bynneman] for Iohn Harrison, →OCLC:
  the Scots would most holilie and handfastlie promise , the English would forthwith depart with a quiet armie