by-chance

(r) through chance, "To sleep, perchance to dream.." perchance,
(r) by accident
- betrayed by a word haply overheard
by luck, haply,
(r) without advance planning
- they met accidentally
accidentally, unexpectedly, circumstantially,

Synonyms

perchance by luck haply accidentally unexpectedly circumstantially

Antonyms

advisedly by choice by design deliberately designedly intentionally on purpose purposely

Words of close approximity