suddenly

Entry Definition
suddenly, all at once
s/he is suddenly happy, is overcome by joy, is wide-eyed with happiness
s/he encounters it suddenly or without warning, happens on it by surprise
sometime (i.e., at some unknown, unexpected, undetermined, or unspecified time); might, may (see examples); suddenly
it collapses quickly or suddenly
suddenly and without apparent reason, without being asked, unexpectedly
without cause, for no reason; without warning, suddenly