This is the 7704th most frequent Japanese word.
厚かっ
The word "厚かっ" is a conjugated form of "厚い" (atsui), meaning "thick" or "kind," depending on context.
The word "厚かましく" here is used to describe the impudent or shameless nature of someone's actions.
彼の行動は厚かましく感じられた。
His behavior felt impudent.
The word "厚かった" here is used literally to describe the thickness of the fabric.
この布は非常に厚かったので、冬に適している。
This fabric was very thick, making it suitable for winter.
The word "厚かましい" here is used metaphorically to indicate audacious or presumptuous behavior.