tendan verb English. Is useful. Note. Oft. with the negative. Example sentence: Subanen. Nda'i petendanan dun. English. S.o. has no use for it. Example sentence: Subanen. Si Uan kia, ma'niin nda'i petendananen dig duma nen, saula' medatu' na, muka' mi'idukadu na. English. It's as if What's-His-Name has nothing to do with (i.e. finds to be useless) his fellow men, now that he is rich and educated.