I need help with this one word
 

Okay, I feel a bit dumb, I need help with this one word. It's an adjective that means to have a lack of opinion, as in someone who agrees with someone all of the time, or doesn't challenge them enough is "this word". The word's on the tip of my tongue, but I can't think of it exactly. Again, I feel dumb for not knowing the word I'm looking for. Can someone help me? It would be much appreciated. =)

Sycophant?

Nah close, but it's a specific adjective I'm looking for.

Obsequious?

Ah whoops, adjective. Submissive, complacent, ingratiating, meek.

Ah nevermind, I found it, the word I was looking for was "indifferent". I knew it was on the tip of my tongue, god I feel dumb. I appreciate you guys helping out though.

Ah, bit of a misleading description, but good.

An ex-girlfriend used it to describe me one time, cause whenever there was something she wanted to do with me (for example, watching a certain movie that just came out in theatres), I would always go along with it, regardless of whether or not I really wanted to or not.

That would not describe someone who's indifferent. It would describe someone who's noncontentious, or a sycophant , as someone suggested earlier in thew thread.

If you really didn't want to go then you weren't indifferent.