A coward or timid person; someone who is easily frightened and hesitant to act because of fear.
彼は小さな物音にも反応する、かなりの恐がりだ。
He's quite a fearful person who reacts even to small noises.
子どもの頃は恐がりで、暗い場所に入れなかった。
As a child I was timid and couldn't go into dark places.
犬が苦手で、犬を見ると恐がりの態度を取る。
He's uncomfortable with dogs and acts timid when he sees one.