adj. slippery; elusive, tricky, difficult to grasp
adv. in a slippery manner; elusively
n. slipperiness; elusiveness
v. to make or become slippery or elusive

Dez motmahus.
Fate is elusive/slippery.
(Paarthurnax, 000556DB)

Yes... one of his allies could tell us. Motmahus... But it will not be so easy to... convince one of them to betray him.
Motmahus = “slippery” = “tricky”
(Paarthurnax, 0004591B)

Means slippery, elusive; hard to catch, difficult to grasp.

From motmah ‘slip’ with the adjective suffix -us.