Denshi Jisho — Online Japanese dictionary

忍耐 にんたい endurance; perseverance; patience
Common word, Noun, Suru verb 
忍耐 にんたいしん endurance; perseverance; patience
Noun 
忍耐 にんたいりょく fortitude
Noun 
忍耐強い にんたいづよい persevering; very patient
Adjective 

You can also

Look up kanji details for 忍耐.

Try a Yahoo Jisho search for 忍耐 .
Try a Goo Jisho search for 忍耐 .
Try a Google search for 忍耐 .