On impulse; without premeditation:
— He decided to go to Chicago on the spur of the moment.
synoniem: suddenly.
Roget 113:
instantaneously
etc.
adj.;
in no time,
in less than no time;
presto,
subito†,
instanter,
suddenly,
at a stroke,
like a shot;
in a moment
etc.
n..
in the blink of an eye,
in the twinkling of an eye,
in a trice;
in one's tracks;
right away;
toute a l'heure [Fr.];
at one jump,
in the same breath,
per saltum [Lat.],
uno saltu [Lat.];
at once,
all at once;
plump,
slap;
at one fell swoop;"
at the same instant
etc.
n.;
immediately
etc.
(early)
132;
extempore,
on the moment,
on the spot,
on the spur of the moment;
no sooner said than done;
just then;
slap-dash
etc.
(haste)
684.
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Roget 118:
at this time,
at this moment
etc.
113;
at the present time
etc.
n.;
now,
at present;
at hand.
at this time of day,
today,
nowadays;
already;
even now,
but now,
just now;
on the present occasion;
for the time being,
for the nonce;
pro hac vice. [Lat.];
on the nail,
on the spot;
on the spur of the moment,
until now;
to this day,
to the present day.
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Roget 132:
early,
soon,
anon,
betimes,
rath†;
eft,
eftsoons;
ere long,
before long,
shortly;
beforehand;
prematurely
etc.
adj.;
precipitately
etc.
(hastily)
684;
too soon;
before its time,
before one's time;
in anticipation;
unexpectedly
etc.
508.
suddenly
etc.
(instantaneously)
113;
before one can say 'Jack Robinson',"
at short notice,
extempore;
on the spur of the moment,
on the spur of the occasion
[Bacon];
at once;
on the spot,
on the instant;
at sight;
offhand,
out of hand;
a' vue d'oeil [Fr.];
straight,
straightway,
straightforth†;
forthwith,
incontinently,
summarily,
immediately,
briefly,
shortly,
quickly,
speedily,
apace,
before the ink is dry,
almost immediately,
presently at the first opportunity,
in no long time,
by and by,
in a while,
directly.
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Roget 134:
opportunely
etc.
adj.;
in proper course,
in due course,
in proper season,
in due season,
in proper time,
in due time;
for the nonce;
in the nick of time,
in the fullness of time;
all in good time;
just in time,
at the eleventh hour,
now or never.
by the way,
by the by;
en passant [Fr.],
a propos [Fr.];
pro re nata [Lat.],
pro hac vice [Lat.];
par parenthese [Fr.],
parenthetically,
by way of parenthesis,
incidentally;
while speaking of,
while on the subject;
extempore;
on the spur of the moment,
on the spur of the occasion;
on the spot
etc.
(early)
132.
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Roget 612:
extempore,
extemporaneously;
offhand,
impromptu,
a limproviste [Fr.];
improviso†;
on the spur of the moment,
on the spur of the occasion.