Synonyms of the word

accidental

• adj. Not essential; incidental, secondary.
• adj. (philosophy) Nonessential to something's inherent nature (especially in Aristotelian thought).
• adj. (music) Adjusted by one or two semitones, in temporary departure from the key signature.
• adj. Occurring sometimes, by chance; occasional.
• adj. Happening by chance, or unexpectedly; taking place not according to the usual course of things; by accident,…
• adj. (geometry) Being a double point with two distinct tangent planes in 4-dimensional projective space.
• n. A property which is not essential; a nonessential; anything happening accidentally.
• n. (painting, plural only) Those fortuitous effects produced by luminous rays falling on certain objects…
• n. (music) A sharp, flat, or natural, occurring not at the commencement of a piece of music as the signature,…

adventitious

• adj. From an external source; not innate or inherent, foreign.
• adj. Accidental, additional, appearing casually.
• adj. (genetics, medicine) Not congenital; acquired.
• adj. (biology) Developing in an unusual place or from an unusual source.

casual

• adj. Happening by chance.
• adj. Coming without regularity; occasional or incidental.
• adj. Employed irregularly.
• adj. Careless.
• adj. Happening or coming to pass without design.
• adj. Informal, relaxed.
• adj. Designed for informal or everyday use.
• n. (Britain, Australia, New Zealand) A worker who is only working for a company occasionally, not as its…
• n. A soldier temporarily at a place of duty, usually en route to another place of duty.
• n. (Britain) A member of a group of football hooligans who wear expensive designer clothing to avoid police…
• n. One who receives relief for a night in a parish to which he does not belong; a vagrant.
• n. (video games, informal) A player of casual games.
• n. (dated) (Britain) A tramp.

chance

• n. (countable) An opportunity or possibility.
• n. (uncountable) Random occurrence; luck.
• n. (countable) The probability of something happening.
• n. (countable, archaic) What befalls or happens to a person; their lot or fate.
• v. (archaic, intransitive) To happen by chance, to occur.
• v. (archaic, transitive) To befall; to happen to.
• v. To try or risk.
• v. To discover something by chance.
• v. (Belize) To rob, cheat or swindle someone.
• adj. (rare) Happening by chance, casual.

extrinsic

• adj. external, separable from the thing itself, inessential.
• adj. not belonging to, outside of.

inadvertent

• adj. not intentional; not on purpose; not conscious.

unintended

• adj. Not intended; unplanned.

unplanned

• adj. unintentional; not intended.
• adj. spontaneous and not thought through in advance.
• adj. not having any structure or organization.