pretty weak sauce

weak sauce
NOUN
something that is of a poor or disappointing standard or quality:
"the rest of your argument is weak sauce" · "their handling of those bunts was some weak sauce"
ADJECTIVE
of a poor or disappointing standard or quality:
"don't buy this weak-sauce car even with the price cut" · "the weak-sauce pitching staff"
SIMILAR:
substandard
bad
deficient
defective
faulty
imperfect

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German
schwache Sauce
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Merriam-Webster
https://www.merriam-webster.com/dictionary/weak sauce
Weak sauce Definition & Meaning - Merriam-Webster
Web: something inferior, ineffective, or unimpressive : something weak When it comes to employer-based coverage, the plan wouldn't do much … Honestly, this is weak sauce, and …

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weak sauce
slang; calling one "weak sauce" compares said individual to the "mild" sauce found at Taco Bell; weak, insignificant, attempting to be like the other hot sauces, but not living up to expectations.
Damn, that fool at the gym was weak sauce.