не́чего
predicative
impersonal
it's no use, it's no good doing somrhing; there is no need to
INF
doing/to do something
не́чего разгова́ривать
it's no use, or no good, talking
ей не́чего беспоко́иться об э́том
she need not be anxious about it
there is no need, it is no use
DAT
for someone
INF
to do something
не́чего жа́ловаться
stop complaining
(lit. “it is no use complaining”)
used in the following idiomatic expressions
тут не́чему удивля́ться
there is nothing to be surprised at
не́чему ра́доваться
there is no reason to rejoice, there is nothing to be happy about
used in the following idiomatic expressions
не́чего де́лать!
there is nothing to be done!; it can't be helped!; there was nothing to be done!, it couldn't be helped with a verb in the past tense
не́чем похва́статься
there's nothing to be proud of; it's nothing to boast about