見るに忍びない

みるにしのびない

So miserable that it is painful to look at, can't bear to look at, painful to watch

忍び忍び

しのびしのび

stealthily

忍び

しのび

stealth

忍び笑い

しのびわらい

stifled laugh, chuckling, snickering

忍び難い

しのびがたい

intolerable, unbearable

忍び逢い

しのびあい

clandestine meeting, rendezvous, tryst, secret meeting (e.g. for lovers)

忍び声

しのびごえ

whispering

忍び音

しのびね

whispering, quiet weeping

忍び足

しのびあし

stealthy steps, soft steps

忍び手

しのびで

silent clap (done during a funeral or during certain rites at the Ise Grand Shrine)

お忍び

おしのび

travelling incognito (traveling)

忍び刀

しのびがたな

Ninja sword

忍びがたい

しのびがたい

intolerable; unbearable

忍び歩き

しのびあるき

travelling incognito (traveling)

忍び出し

しのびだし

sneaking out, creeping out

忍び泣き

しのびなき

quiet weeping

忍び込む

しのびこむ

to creep in, to steal in

忍び返し

しのびがえし

bamboo wall-top spikes (or wood, iron), spikes placed at the top of a wall to repel thieves

忍び泣く

しのびなく

to shed silent tears