Definition of 曰く言い難し (いわくいいがたし)
いわいがた
                        曰く言い難し
いわくいいがたし
iwakuiigatashi
expression
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It is hard to explain, It is hard to say
Related Kanji
| 曰 | say, reason, pretext, history, past, flat sun radical (no. 73) | 
| 言 | say, word | 
| 難 | difficult, impossible, trouble, accident, defect |