no perfect rhymes, but for a near rhyme try words that end with TIC.
He remained phlegmatic throughout the emergency, showing no signs of panic or agitation.
He had a hihly phlegmatic response upon hearing about the death of his father.
He started going out with this phlegmatic girl, he'll never be happy with her, she has no emotions whatsoever.
Phlegmatic is pronounced as "fleg-MAT-ik" with the stress on the second syllable.
Susan is phlegmatic, she answers questions thoughtfully after much consideration, and she is always polite.
emotional
The antonym of phlegmatic is likely to be words like passionate, fervent, or zealous, which describe someone who is energetic, enthusiastic, and excitable.
The phlegmatic boy was not even excited about the Halloween party invitation he had received. Mrs. B had experienced a tumour in her frontal lobe rendering her completely indifferent. Testing Mrs. B whether or not she could see objects in the right or left field of vision was difficult primarily because she was so phlegmatic about everything--what did it matter if the object appeared to the left or right?
Phlegmatic
inactive lazy passive phlegmatic
Bi- partisan patience and tolerance
The four types of temperament are sanguine, choleric, melancholic, and phlegmatic. Sanguine individuals are sociable and outgoing, while choleric individuals are assertive and ambitious. Melancholic individuals are analytical and introspective, while phlegmatic individuals are easygoing and calm.