serendubious 

When an unlikely chance encounter leaves you wondering if it really was chance.

My ex just happened to show up at The Club last night; haven’t been in months. It was serendubious.

serendubious by Ozymandiasm July 31, 2021

Splendubious 

Being both happy for, and suspicious of something.

Wanting something to be true, but doubting it's Factuality.

"Feeling pretty splendubious about these smartphone concepts"

"That cool guy is going to be at that party? Splendubious."

Splendubious by Zaneith February 24, 2013