Adverb taking the 'to' particle, Adverb (fukushi), Suru verb
gently; quietly; calmly
Onomatopoeic or mimetic wordoften as 〜した adj. phrase to mean 'gentle', etc.
花子はオットリしているようで、やるときはやる人間だ。Hanako seems quiet, but she gets things done when it's necessary.