懇意[koni] kindness
懇願[kongan] entreaty
懇情[konjou] kindliness
懇親[konshin] friendship
懇親会[konshinkai] friendly reunion

懇請[konsei] appeal
懇切[konsetsu] kindness
懇談[kondan] informal talk
懇談会[kondankai] social gathering

慇懃[ingin] courtesy
慇懃無礼[inginburei] hypocritical courtesy
馬鹿慇懃[bakaingin] overdone politeness

慇懃丁重[inginteichou] polite and courteous
慇懃を通じる[inginwotsuujiru] to have a surreptitious sexual relationship with
慇懃な間柄[inginnaaidagara] (on) friendly terms with

諄い[kudoi] verbose

諄々しい[kudokudoshii] wordy