A rhyming word pair for a sad clown is down clown
sad lad
sad lad
sad lad
bluer moo-er
Sad Dad.
sad, Dad, unhappy Pappy
"Brown fast bother" could be a potential rhyming pair for "downcast father".
"Grim hymn"
A glum plum.
"Saddened dad" is a rhyming pair for an unhappy father.
sad lad
Rejected Boy Rejected coy Ejected Toy