WIBU to give an honest answer here?

[Feelbad101]

NC’d for this. Not much to say but, colleague arrived into work this morning after having her lips done. I don’t like it. She asked me what I thought and I said “I don’t think you needed it…but if you’re happy!?” I was only being honest. It looks awful. I feel bad now. WIBU!?

So if OP had gone in all gushing about how much better she looks... somebody else in the room overhears that, already has low self-esteem about how she looks, and takes the colleague's actions and OP's apparent endorsement together and feels pressured to go and get a hideous trout pout for herself (maybe spending money that she really can't afford into the bargain).

Would that be a simple basic kindness?

It's not a 4yo excitedly showing you their indistinct scribble and you telling them what a lovely drawing it is, and how much their mummy and daddy will love it (they will, of course, but not because of the objective quality of the workmanship!) - adults need to understand that not everybody will love the same things as they do; and that's just fine.

I didn't say she had to gush about how wonderful it looks. What's wrong with a simple 'Oh lovely. Was it sore?' or similar before returning to your work?

Don't you think that might also be misinterpreted as insincerity, though?

Obviously I wasn't there, but I'm guessing that she was looking for more than just a "Ooh, lovely" if she went out of her way to solicit opinions.

Otherwise, surely she would have just said "Good morning" as normal and not mentioned the surgery at all, if she wasn't after a big deal.