The highest pKaH value here is 10.8 for triethylamine. That makes triethylamine the strongest base out of all of those listed.

Is triethylamine a strong or weak base?

9.2.

Triethylamine is a weak cohesive and dipolar/polarizable solvent, moderately hydrogen-bond basic and non-hydrogen-bond acidic.

Is trimethylamine a strong base?

To find a stronger base among the following: Trimethylamine or Ammonia. The strongest base among the two is Trimethylamine.