noun, na-adjective, noun which may take the genitive case particle 'no'
the unvarnished truth; frankly; plainly
Almost always used in the adverbial form ありていに, meaning 'frankly' or 'without embellishment'. The noun/adjectival uses are rare and literary.
See also: ありていに
ありていに言えば、その計画は失敗だった。
To put it plainly, the plan was a failure.
彼はありていに事情を話した。
He explained the circumstances frankly.
率直 is a common word for 'frank' or 'straightforward', while ありてい is a rare, literary expression used almost exclusively in the adverbial form ありていに.
正直 means 'honest' and is widely used in everyday speech; ありていに is more about stating something plainly without sugarcoating, often in a formal or written context.
The origin is uncertain. It may be related to the classical Japanese adjective あり (ari, 'to be') and てい (tei, 'appearance'), but the exact derivation is unclear.