堅魚[katsuo] skipjack tuna
堅い[katai] hard
堅果[kenka] nut
堅苦しい[katakurushii] formal
堅固[kengo] solid

堅持[kenji] holding on to
堅城[kenjou] strong fortress
堅陣[kenjin] stronghold
堅調[kenchou] bullish
堅忍[kennin] perseverance

御手玉[otedama] beanbag
御手上げ[oteage] all over
御手盛り[otemori] making arbitrary decisions which benefit oneself
御手洗い[otearai] toilet
お手伝いさん[otetsudaisan] maid

手子摺る[tekozuru] to have much trouble
引っ手繰り[hittakuri] purse snatching
悪手[akushu] poor move
握手[akushu] handshake
安手[yasude] cheap kind