鰥寡

かんか

widow and widower, lonely people

孤独

こどく

isolation, loneliness, solitude

孤独感

こどくかん

sense of isolation, (feelings of) loneliness

孤独死

こどくし

dying alone (esp. of someone who lives alone and dies of natural causes at home without anyone knowing), solitary death

鰥

やもめ

widower, divorced man not remarried

天涯孤独

てんがいこどく

a person without a single relative

百年の孤独

One Hundred Years of Solitude (1967 novel by Gabriel García Márquez)

寡

か

minority, small numbers

孤

こ

being alone; solitude; loneliness

寡産

かさん

low fecundity

寡欲

かよく

unselfishness

寡慾

かよく

wanting little

寡居

かきょ

widowhood

寡少

かしょう

little, few, scanty

寡兵

かへい

small army force

寡男

やもお

widower

寡占

かせん

oligopoly

寡言

かげん

reticence, taciturnity

寡黙

かもく

silent (person), shy, taciturn, reticent, uncommunicative