Answer:

haply

Answer	Crossword Clue
HAPLY	Perchance.
HAPLY	By accident.
HAPLY	By chance.

HAPLY	By chance
HAPLY	By chance, old style
HAPLY	By chance, to a bard
HAPLY	By accident, old-style

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.