Suggestions(5)
The phrase "was lesser" is grammatically correct and can be used in written English.
It is typically used to describe a comparison between two things, with "lesser" indicating that one thing is of a smaller or lower level or degree compared to the other. Example: The impact of the second world war on Europe was significant, but it was lesser compared to the impact on countries directly involved in the conflict. In this sentence, "lesser" is used to show that the impact on Europe was not as great as the impact on countries directly involved.
Dictionary
was lesser
noun
A thing that is of smaller size, value, importance etc.
Exact(60)
Three other sergeants and an officer were placed on administrative duty for what officials said was lesser misconduct.
"I made a deal that was lesser for me because this was all done in good spirits, by everybody," Mr. Allen said.
"I mean, we used to take pride in the fact that our games didn't require updates – it was lesser studios that did that.
Early-weaned heifer BW was lesser (P≤0.08) through breeding.
Higher F removal was noted when flow rate was lesser.
In the present studies, activity yield was lesser compared to immobilization yield.
Consequently, DMD was lesser for the mixed diet versus the top-dressed diet.
The TOC content of the vermicomposts was lesser than initial levels.
The significance of the landmark quality was lesser than that of SIFT.
Qijian Mixture was lesser effective than metformin hydrochloride; however, both showed similar hypoglycemic trend.
The rumen ammonia was not affected while pH was quadratically affected and was lesser for glycerin treatments (quadratic, P=0.04).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com