This is the 8820th most frequent Japanese word.
染っ
"染っ" is not a standalone word but part of the conjugation of "染まる" (somaru), meaning "to be dyed" or "to be stained."
The verb '染める' here means 'to dye,' portraying the context of coloring hair.
彼女の髪は鮮やかに染められた黄色でした。
Her hair was dyed bright yellow.
'染まる' is used, indicating a state of being dyed, in this case by natural light.
空は夕焼けの美しい赤に染まった。
The sky was dyed a beautiful red by the sunset.
'染まる' metaphorically refers to being influenced or affected by something, shown here as habits.