Lest vs. Unless
Difference Between Lest and Unless
For fear thattiptoed lest the guard should hear her.anxious lest he become ill.
Except on the condition that; except under the circumstances that"Exceptional talent does not always win its reward unless favored by exceptional circumstances" (Mary Elizabeth Braddon).
So that someone or something not; in case someone or something might"Lest anyone forget, adolescence is purgatory" (Jon Pareles).
Except for; except.
For fear that; that not; in order that not; in case.He won't go outside, lest he be eaten by those ravenous eagles.
Except on a specified condition; if not.I’m leaving unless I get a pay rise (AmE: raise).
That (without the negative particle); – after certain expressions denoting fear or apprehension.
If not; used with counterfactual conditionals.
for fear that;she tiptoed lest her mother should hear her
Except if; used with hypothetical conditionals.
that (after verbs explicitly expressing fear etc.);he worried lest he should be late