Dippy

If a person were to wash only one side of his face and continually neglect the other side, he would soon become a local curiosity–would be considered dippy.

“He’s dippy,” she informed him. “Absolutely mad. He’ll wreck your ship for you.”

2001, Peter Bradshaw, Review of Legally Blonde, The Guardian, 26 October, 2001, This so-so comedy has Witherspoon as the dippy-yet-smart sorority girl whose ambitious Wasp boyfriend dumps her because she’s a natural blonde, and he’s looking to marry “Jackie not Marilyn”; so she gets a place in his class at Harvard law school to win him back.

“I’ve read in the papers that ye’re dippy about secon’-hand stuff,” she teased, referring to his mania for antiques […]

‘[…] If you’re dippy about a girl, and another fellow has grabbed her, it can’t be pleasant to sit at a writing table, probably with a rotten pen, sweating away while the other fellow dictates “My own comma precious darling period I worship you comma I adore you period How I wish comma my dearest comma that I could press you to my bosom and cover your lovely face with burning kisses exclamation mark”. […]’

The flat was his domain until ten a.m., he informed her brusquely. He liked reading the paper and partaking of a dippy egg in solitude.

Also, salad dressing makes a great dippy sauce. Avoid low-fat salad dressings, which are usually loaded with fillers, sugar, and sodium.

"It's not completely flat," Waddicor points out. "It's a bit up and down dippy. The gradients are quite steep compared with traditional lines."