He Would Not Say Awesome
Yirmiyahu left out a word of praise he could not honestly feel, and the Gemara explains why he could: Hashem is truthful and hates falsehood.
Moshe Rabbeinu praised Hashem as the great, the mighty and the awesome God. The Gemara relates that Yirmiyahu, seeing foreigners carousing in the Heichal, asked: where is His awesomeness? So in his tefillah he called Hashem great and mighty, and left out awesome. Daniel, seeing Hashem's children enslaved, left out mighty. How could they change words that Moshe had set? Rebbi Elazar answers: because they knew that Hashem is truthful, and they would not say anything false about Him. Later the Men of the Great Assembly restored the full praise. They understood that Hashem's patience with the wicked is His greatest might, and that one small nation surviving among all the nations is His awesomeness. That is why they are called great: they returned the crown to its former glory.
Source: Gemara, Yoma 69b (on Yirmiyahu 32:18 and Devarim 10:17)
Some days the words of tefillah feel bigger than what you feel. Yirmiyahu teaches that honesty before Hashem is itself a kind of praise. This week, before Shemoneh Esrei, take one of the words of the first blessing, great, mighty or awesome, and think of one real thing you saw this week that fits it: a recovery, a kindness, a narrow escape. Then say that word slowly, meaning it. Over time, the words you can say honestly will grow.