to put it mildly

mildly | American Dictionary

mildly
adverb
us/ˈmɑɪld·li/
in a mild way:
We were mildly surprised to see him again.
"I think you’ve made a mistake," he said mildly.

Examples of mildly

mildly
Almost half (49.3%) of respondents did not consider themselves to be suffering, and 24.9% felt that they suffered only mildly.
The majority are based around actual or fictitious events with a mildly anti-establishment character, often involving personal and physical threats or accidents.
However, some of the detail is highly contentious, to put it mildly.
Each statement was classified as mildly controlling, moderately controlling, or highly controlling.
Their storylines are slender, and either whimsical or mildly melodramatic.
What if just a couple of symptoms remain (such as some questionable judgment, or a mildly elevated level of energy)?
However, unlike vernacular variants, mildly marked variants demonstrate little or no social stratification and hence are not stigmatized.
As we have pointed out, the students show signs of having learned the mildly marked variant in the present study.
Reported is a patient who was persistently mildly cyanosed due to diastolic right-to-left shunting.
Physical examination showed an acyanotic, mildly tachypneic infant with a respiratory rate of 50 breaths per minute.
The lyrics are mildly plaintive love poems and the music does not so much excite passion as entertain soothingly.
His retreating to her when he has been startled, alerted, slightly hurt, mildly frightened or fatigued seldom elicits her attention.
The experimenter responded by mildly criticizing the child's work and asking the child to draw another circle.
Our analysis suggests that the inbreeding depression contributed by mildly deleterious mutations can be greatly reduced by the effects of finite population size.
The second class consists of mildly deleterious mutations that are only partially recessive.
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