N5 — outside your level filter
however; but — the written contrast connective
何度も練習した。しかし、本番では手が震えた。
nando mo renshuu shita. shikashi, honban de wa te ga furueta.
I practiced over and over. Yet on the day itself my hands shook. neutral
売上は昨年を上回りました。しかし、利益は横ばいのままです。
uriage wa sakunen o uwamawarimashita. shikashi, rieki wa yokobai no mama desu.
Sales exceeded last year's figures. However, profits have stayed flat. neutral
Variants
しかしながらshikashinagaraliterary
heavier and slower — reports, formal correspondence and speeches; identical in meaning, so in ordinary writing it only adds weight.
しかし
しかしshikashiN5formal