adverb, noun or participle which takes 'suru'
bashfully; hesitantly; fidgeting
Describes someone who is shy, embarrassed, or unable to act decisively, often accompanied by small restless movements. Used with する to mean 'to be bashful/hesitant/fidgety'.
彼はもじもじしながら自己紹介をした。
He introduced himself bashfully, fidgeting.
そんなにもじもじしないで、はっきり言ってください。
Don't be so hesitant; please say it clearly.