i-adjective
Used in the pattern ...とおぼしい to mean 'seems to be' or 'appears to be'. Often found in literary or formal contexts; in casual speech, らしい or みたい is more common.
See also: 思しき
彼は犯人とおぼしい男を追いかけた。
He chased the man who appeared to be the culprit.
その書類は本物とおぼしい。
That document seems to be genuine.