Insipidus
Insipidus means “Lacking taste; unpalatable; Lacking flavor or zest; not tasty. E.g. an insipid soup”. Insipidus comes from the Latin word īnsipidus:  Latin in-, not; + Latin sapidus, savory (from sapere, to taste)

Diabetes Insipidus
[New Latin diabētēs īnsipidus, literally, insipid diabetes (so called because the urine of those suffering from the disease lacks the sweet taste characteristic of diabetes mellitus): Medieval Latin diabētēs, diabetes; see diabetes + Latin īnsipidus, insipid; see insipid.]

Mellitus
Mellitus comes from the Latin word mellītus which means “honey-sweet”.

Diabetes Mellitus
“[New Latin diabētēs mellītus, literally, honey-sweet diabetes (so called because excessive glucose is excreted in the urine and the resulting sweet taste of the urine was used in diagnosis): Medieval Latin diabētēs, diabetes; see diabetes + Latin mellītus, honey-sweet (Latin mel, mell-, honey;”

 

Reference
thefreedictionary.com

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