| inadvertently(adverb, short, sudden, suddenly, unexpectedly) |
| unknowingly(adverb, short, sudden, suddenly, unexpectedly) |
| unintentionally(adjective, adverb, short, intention, sudden) |
| accidentally(adverb, short, sudden, suddenly, unexpectedly) |
| involuntarily |
| unawares(adverb, suddenly, unexpectedly) |
| unconsciously(adverb, short, sudden, suddenly, unexpectedly) |
| by chance(expression, adjective, idiom, adverb, intention) |
| unwillingly |
| by accident(expression, idiom, short, sudden, suddenly) |
| casually |
| fortuitously(adjective, adverb, intention, fortunately, luckily) |
| ignorantly(adverb, short, sudden, suddenly, unexpectedly) |
| mistakenly(adverb, short, sudden, suddenly, unexpectedly) |
| randomly |
| unexpectedly(adverb, short, sudden, suddenly, unawares) |
| abruptly(short, sudden, suddenly, unexpectedly, unawares) |
| by mistake(expression, short, sudden, suddenly, unexpectedly) |
| by surprise(expression, short, sudden, suddenly, unexpectedly) |
| carelessly(adverb, short, sudden, suddenly, unexpectedly) |