tilju -tij- gismu

x₁ is heavy/weighty in mass/weight by standard x₂.

(cf. linto; carmi, se junri for metaphor, bunda, junta)

In notes:

bunda: x₁ is x₂ (def. 1) local weight unit(s) [non-metric], standard x₃, subunits [e.g. ounces] x₄.
carmi: x₁ is intense/bright/saturated/brilliant in property (ka) x₂ as received/measured by observer x₃.
junri: x₁ (person) is serious/earnest/has gravity about x₂ (event/state/activity).
junta: x₁ is the weight of object x₂ in [gravitational or other force] field x₃.
linto: x₁ is light in mass/weight by standard x₂.
statilju: x₁ is an anchor attached to x₂ holding x₃ stationary.
tsazezu: x₁ performs workout/exercise/training x₂ (ka) using equipment/accessories x₃.