noun which may take the genitive case particle 'no'
token; for form's sake; perfunctory
Describes something done or given merely as a formality, without real substance or sincerity. Often used in humble contexts when offering a small gift or gesture.
これは形ばかりのお礼です。
This is just a small token of my gratitude.
He gave a perfunctory apology.
会議は形ばかりで、実質的な議論はなかった。
The meeting was just for show; there was no real discussion.