nerve

[1]

steel

[1]	courage , nervus , coolness , boldness , bravery , intrepidity , determination , valour , daring , fearlessness , dauntlessness , pluck , mettle , spirit , fortitude , will , tenacity , steadfastness , staunchness , firmness , doughtiness , resoluteness , (Colloq) guts , grit , gumption , spunk , (US) sand , (Brit) bottle , (US) moxie , (Colloq) (Slang) balls
[2]	effrontery , heart , mettle , brazenness , gall , spunk , impertinence , brass , impudence , insolence , audacity , brashness , presumption , presumptuousness , temerity , (Colloq) cheek , sauce , chutzpah , (Slang) crust
[3]	get on someone's nerves , boldness , brass , annoy , irritate , face , cheek , upset
[4]	nerves , tension , nervousness , hysteria , anxiety , fretfulness , stress , worry , apprehension , fright , (Colloq) the jitters , (Slang) the willies , the heebie-jeebies , (US) the whim-whams