biskeptical

1. When you're pretty sure you wouldn't enjoy making out with a member of the same sex.

2. Doubtful that bisexuality is real or that a person claiming to be bisexual really is.

1. "I'm flattered that Delia's interested, but I'm biskeptical."

2. "She says she's into both, but she married a guy. I dunno. I'm biskeptical."