れと
soreto naku

Adverb

1. indirectly; obliquely; implicitly; by implication; in a roundabout way; casually

Usually Written in Kana
かれ手紙 てがみはその事件 じけんにそれとなくふれている。
kareno tegamiwa sono jikenni soretonaku furete iru.
His letter alludes to the event.
Other forms: