5週1日目 信じがたい
Evaluation・cause・basis
接続：V-stem＋づらい
difficult to do because of emotions or circumstances
注意 / Note：がたい tends to be difficult to accept in terms of psychology and writing; にくい is difficult to be objective; づらい is difficult because of emotions or situations.
比較 / Compare：Same song: 〜がたい／〜にくい. These models are often mistakenly chosen for each other — carefully read the 接続 and nuances above and then decide.
よく出る形 / Common form：動ます形＋づらい。The reason lies with the DOER — embarrassment, pain, awkwardness. So 言いづらい (shy to speak) is different from 言いにくい (hard to pronounce).
上司には相談しづらい。
Difficult to communicate with superiors.
本当のことは言いづらい。
The truth is difficult to tell.
断りづらくて、つい引き受けてしまった。
I was afraid to refuse so I accidentally accepted.