Indifferent
Part of speech: adverb
Definition: To some extent, in some degree (intermediate between very and not at all); moderately, tolerably, fairly.
Part of speech: adjective
Definition: Not caring; apathetic. Mediocre, usually used negatively in modern usage. Being in the state of neutral equilibrium.
Example sentence: You can love me, you can hate me, but just don't be indifferent. Care about it enough to watch.
So-so
Part of speech: adjective
Definition: Neither good nor bad; tolerable, passable, indifferent.
Part of speech: adverb
Definition: Neither very well nor very poorly.