訝しい

Etymology
From. Some sources cite this first as ipukasi- in the  of 720; however, that may only be traceable to supplemental glosses added later to the kanbun original. Other references cite this to the  of 759, where this word is attestable in both rebus and phonetic spellings.

Adjective

 * 1) suspicious, disbelieving
 * 2) doubtful, fishy