혼자
honja · TOPIK 1
alone, by oneself
honja: the hon- echoes hol-, the native Korean root for single (홀로, 홀수)
혼자 comes from older 혼자/호올로 forms tied to the native root 홀-, meaning single or unpaired. The same root gives 홀로 (alone) and 홀수 (odd number). Link hon- to hol- and the sense of one person, no partner, follows.