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(150 results)
Antonyms:
obligatory
Often used in the same context:
attachable,
adjustable,
detachable,
inbuilt,
mandatory,
automatic,
selectable,
obligatory,
removable,
keyless,
stowable,
compatible,
customizable,
lockable,
sunblind,
retractable,
compulsory,
waterproof,
enhanced,
mountable,
antilock,
interchangeable,
standard,
equipped,
expandable,
threadless,
gusseted,
extra,
cocurricular,
fillable,
superfluous,
complimentary,
available,
immersible,
integrated,
omnidirectional antenna,
additional,
zoot,
de rigueur,
sealable,
variable,
adaptive,
subminiature,
customised,
insertable,
octal,
assignable,
unlimited,
ductless,
continental breakfast,
data encryption,
antistatic,
alphanumeric,
scart,
outboard,
porterage,
handy,
nonmandatory,
closable,
push button,
foglamp,
programmable,
cupholder,
daisy chaining,
rainproof,
plus,
underslung,
inline,
unmounted,
foldable,
elasticized,
error correction code,
preset,
manual,
ripstop,
weatherproof,
astroscope,
phosphor bronze,
countersink,
reciprocating saw,
lite,
chamfered,
backward compatible,
transmissive,
spline,
flanged,
extendable,
actuated,
lavalier,
automatic transmission,
unthreaded,
microphonic,
nonslip,
detent,
rearmost,
essential,
shiftable,
baud rate,
pricey,
sueded,
preassembled,
cleanable,
designator,
filename,
barrett,
centrifugal,
encryption,
ff,
initiators,
keyboard,
operand,
operands,
specifier,
token,
\u00bb,
animator,
arbitration,
beforehand,
boolean,
cas,
catalyst,
clark,
instantiated,
checking,
nonessential,
reusable,
supplied,
declarative,
indispensible,
required,
standardized,
generic,
specialized,
standalone,
configurable,
delete,
indicative,
predesigned,
semiempirical
Appears in the definition of:
extension,
filename extension,
file name extension,
optionally,
punks
Synonyms:
elective,
ex gratia,
facultative,
nonmandatory,
nonobligatory
Also try:
— Nouns for optional:
parameter,
argument,
clause,
parameters,
subjects,
features,
equipment,
arguments,
feature,
subject,
courses,
more...
Commonly used words are shown in bold. Rare words are dimmed. Click on a word above to view its definition.
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