suddenly

As an adverb suddenly is

happening quickly and with little or no warning; in a sudden manner.

Directly is a related term of suddenly.

As adverbs the difference between directly and suddenly

is that directly is in a direct manner; in a straight line or course while suddenly is happening quickly and with little or no warning; in a sudden manner.

As a conjunction directly

is as soon as.

Bang is a synonym of suddenly.

As an adverb suddenly is

happening quickly and with little or no warning; in a sudden manner.

As adverbs the difference between precipitously and suddenly

is that precipitously is abruptly; in a precipitous manner while suddenly is happening quickly and with little or no warning; in a sudden manner.

As adverbs the difference between suddenly and accidently

is that suddenly is happening quickly and with little or no warning; in a sudden manner while accidently is by accident, unexpectedly, by chance; fortuitously, unintentionally.

Suddenly is a related term of smack.

As adverbs the difference between suddenly and smack

is that suddenly is happening quickly and with little or no warning; in a sudden manner while smack is as if with a smack or slap.

As a noun smack is

a distinct flavor or smack can be a small sailing vessel, commonly rigged as a sloop, used chiefly in the coasting and fishing trade and often called a or smack can be a sharp blow; a slap see also: spank .

As a verb smack is

to indicate or suggest something or smack can be to slap someone, or to make a smacking sound.

Headlong is a related term of suddenly.

As adverbs the difference between headlong and suddenly

is that headlong is with the head first or down while suddenly is happening quickly and with little or no warning; in a sudden manner.

As an adjective headlong

is precipitous.

As a verb headlong

is to precipitate.

As adverbs the difference between suddenly and adeptly

is that suddenly is happening quickly and with little or no warning; in a sudden manner while adeptly is with great skill or knowledge.

As adverbs the difference between unfortunately and suddenly

is that unfortunately is happening through bad luck, or because of some unfortunate event while suddenly is happening quickly and with little or no warning; in a sudden manner.