[eejanaika] (exp) (1) isn't it great?; (n) (2) carnival-like religious celebrations (e.g. dancing festivals) that occurred across Japan from June 1867 to May 1868
[naika] (exp) (1) (See ませんか) (used to ask a question in the negative) won't (hasn't, isn't, doesn't, etc.); (2) (used to make invitations, express desires or give indirect commands) won't you
[masenka] (exp) (1) (pol) (See ます) (used to ask a question in the negative) won't (hasn't, isn't, doesn't, etc.); (2) (used to make invitations, express desires or give indirect commands) won't you; (P)
[いっすんのこういんかろんずべからず, issunnokouinkaronzubekarazu] (exp) (id) (arch) There isn't a moment to be wasted; Every moment is precious; make hay while the sun shines