もかまわず details
heedless of; without caring about — the agent brushes past something they had reason to mind
あいつ、人目もかまわず大声で泣いてたよ。
aitsu, hitome mo kamawazu oogoe de naiteta yo.
He was bawling out loud right there, not caring who saw. casual
彼は服が汚れるのもかまわず、川に入って子犬を助けた。
kare wa fuku ga yogoreru no mo kamawazu, kawa ni haitte koinu o tasuketa.
Heedless of his clothes getting filthy, he waded into the river and rescued the puppy. neutral
Examples
heedless of X — X is something the agent had every reason to mind, and did not
あいつ、人目もかまわず大声で泣いてたよ。
aitsu, hitome mo kamawazu oogoe de naiteta yo.
He was bawling out loud right there, not caring who saw. casual
彼は服が汚れるのもかまわず、川に入って子犬を助けた。
kare wa fuku ga yogoreru no mo kamawazu, kawa ni haitte koinu o tasuketa.
Heedless of his clothes getting filthy, he waded into the river and rescued the puppy. neutral
委員の一人が、周囲の制止もかまわず自らの主張を繰り返しており、議事が滞っております。
iin no hitori ga, shuui no seishi mo kamawazu mizukara no shuchou o kurikaeshite ori, giji ga todokootte orimasu.
One committee member keeps restating his own case heedless of those trying to stop him, and proceedings have stalled. formal
Formation
{N}もかまわずattaches to nounplain clause + のもかまわずattaches to plain clause
Notes
迷惑, 危険; a clause joins through の. なりふりかまわず
("with no thought for appearances") has frozen and drops the も.
Related patterns
Similar
にかかわらず is an impersonal claim that a variable does not move an outcome and needs no agent at all (天候にかかわらず開催する); もかまわず requires a human who noticed the obstacle and went on anyway, which is why it always carries the speaker's verdict on that person and にかかわらず carries none.
Both mark a cost brushed aside, and they name opposite halves of it — てまで names the extreme ACT undertaken (借金してまで買う), もかまわず the OBSTACLE ignored (人目もかまわず泣く); てまで is reliably disapproving, while もかまわず only demands a verdict and can just as well admire (危険もかまわず飛び込んだ).
Lookalikes
Both negate 構う, and the person doing the not-minding is a different one — ても構わない is the SPEAKER granting permission over someone else's act ("I don't mind if you do"), while もかまわず reports a third party disregarding something; ても構わない never narrates behaviour and もかまわず never grants anything.
Same 名詞＋助詞＋ず shape and both gloss "regardless of", but を問わず is institutional and agentless — a rule waiving a criterion (年齢を問わず) — while もかまわず needs a human who KNEW they should mind and pressed on regardless (人目もかまわず), and always carries the speaker's verdict on them.