This is the 836th most frequent Czech word.
neměli
"Neměli" means "they did not have" in English.
In this sentence, 'neměli' is used as the past tense, third person plural form of the verb 'mít', illustrating lack of possession or availability of time.
Neměli jsme čas na dokončení projektu.
We didn't have time to complete the project.
Here, 'neměli' is part of a conditional sentence, used in the polite form to give advice regarding neglecting responsibilities.
Neměli byste zapomínat na své povinnosti.
You shouldn't forget your responsibilities.
In this usage, 'neměli' is used to express a past subjective mood implying an action that shouldn't have occurred.