～難い
～がたい · ～gatai · JLPT N2 · noun
bash
🪨 gatai = katai (hard) with a voiced g: verb stem + gatai = hard to do
難 means difficult, as in 困難 (konnan, hardship). As a suffix, katai becomes gatai: 信じ難い (shinjigatai) means hard to believe. It is used for things that are hard emotionally or morally, not hard physically.