predict + -able

source: Darby JJBA GIF - Darby JJBA OraOra - Discover & Share GIFs

able to be predicted:

予測できる.

e.g. the market is volatile and never predictable.

derogatory behaving or occurring in a way that is expected:

｟けなして｠ (結末の)予測がつく, (人の行動などの)先が読めてしまう (!退屈さを暗示)

e.g. the characters were very stereotyped and extremely predictable.