| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | not planned |
| Synonyms: | accidental, aimless, casual, chance, erratic, extemporaneous, fortuitous, haphazard, inadvertent, involuntary, purposeless, random, unconscious, undesigned, undevised, unexpected, unforeseen, unintended, unplanned, unpremeditated, unthinking, unthought, unwitting |
| Antonyms: | deliberate, intended, intentional, planned |
| Main Entry: | accidental |
| Part of Speech: | adjective |
| Definition: | happening unexpectedly |
| Synonyms: | adventitious, casual, chance, coincidental, contingent, fluky, fortuitous, inadvertent, incidental, random, uncalculated, unexpected, unforeseen, unintended, unintentional, unplanned |
| Notes: | accidental stresses chance; fortuitous so strongly suggests chance that it often connotes absence of cause |
| Antonyms: | decided, designed, essential, intended, intentional, planned, premeditated |
| Main Entry: | automatic |
| Part of Speech: | adjective |
| Definition: | done by habit |
| Synonyms: | autogenetic, habitual, impulsive, instinctive, instinctual, intuitive, involuntary, knee-jerk, mechanical, natural, perfunctory, reflex, routine, spontaneous, unconscious, unforced, unintentional, unmeditated, unthinking, unwilled |
| Antonyms: | thought-out |
| Main Entry: | casual |
| Part of Speech: | adjective |
| Definition: | chance, random |
| Synonyms: | accidental, adventitious, by chance, contingent, erratic, extemporaneous, extempore, fluky, fortuitous, impromptu, improvised, impulsive, incidental, infrequent, irregular, occasional, odd, offhand, serendipitous, spontaneous, uncertain, unexpected, unforeseen, unintentional, unplanned, unpremeditated |
| Notes: | casual means suited for everyday use, informal or occurring by chance - while causal means involving or constituting a cause |
| Antonyms: | deliberate, painstaking, planned, premeditated |
| Main Entry: | chance |
| Part of Speech: | adjective |
| Definition: | accidental, unforeseeable |
| Synonyms: | adventitious, at random, casual, contingent, fluky, fortuitous, fortunate, happy, inadvertent, incidental, lucky, odd, offhand, unforeseen, unintentional, unlooked for, unplanned |
| Antonyms: | designed, foreseeable, planned, understood |
| Main Entry: | coincidental |
| Part of Speech: | adjective |
| Definition: | accidental |
| Synonyms: | casual, chance, circumstantial, fluky, fortuitous, incidental, unintentional, unplanned |
| Antonyms: | decided, deliberate, designed, planned |
| Main Entry: | inadvertent |
| Part of Speech: | adjective |
| Definition: | accidental |
| Synonyms: | careless, chance, feckless, heedless, irreflective, negligent, not on purpose, reckless, thoughtless, uncaring, unconcerned, undesigned, undevised, unheeding, unintended, unintentional, unmindful, unplanned, unpremeditated, unthinking, unthought, unwitting |
| Antonyms: | advertent, attentive, deliberate, intentional, planned |
| Main Entry: | involuntary |
| Part of Speech: | adjective |
| Definition: | automatic; not done willingly |
| Synonyms: | automatic, begrudging, blind, compulsory, conditioned, forced, grudging, habitual, impulsive, instinctive, instinctual, knee-jerk, obligatory, reflex, reflexive, reluctant, spontaneous, uncalculated, unconscious, uncontrolled, unintended, unintentional, unmeditated, unpremeditated, unprompted, unthinking, unwilling, unwitting, will-less |
| Antonyms: | conscious, intentional, unforced, voluntary |
| Main Entry: | spontaneous |
| Part of Speech: | adjective |
| Definition: | impulsive, willing |
| Synonyms: | ad-lib, automatic, break loose, casual, down, extemporaneous, extempore, free, free spirited, from the hip, impetuous, impromptu, improvised, inevitable, instinctive, involuntary, irresistible, natural, off top of head, off-the-cuff, offhand, simple, unartful, unavoidable, unbidden, uncompelled, unconscious, unconstrained, uncontrived, uncontrolled, unforced, unintentional, unplanned, unpremediated, unprompted, unsophisticated, unstudied, up front, voluntary |
| Antonyms: | deliberate, intended, planned, premeditated |