Synonyms of accidental in English:

accidental


See definition of accidental

adjective

1‘accidental damage’

SYNONYMS
fortuitous, chance, occurring by accident, occurring by chance, adventitious, fluky, coincidental, casual, serendipitous, random, aleatory
unexpected, unforeseen, unanticipated, unlooked-for
unintentional, unintended, inadvertent, involuntary, unplanned, unpremeditated, unthinking, unmeant
unwitting, unknowing, unconscious, subconscious
mistaken, misguided
ANTONYMS

intentional, planned

2‘the location is accidental and contributes nothing to the poem’

SYNONYMS
incidental, unimportant, by the way, by the by, supplementary, subsidiary, subordinate, secondary, marginal, minor, lesser, accessory, peripheral, tangential, extraneous, extrinsic, parenthetical, irrelevant, immaterial, beside the point, of little account, unnecessary, non-essential, inessential
ANTONYMS

essential, central