dangerous; risky; lacking in security or stability

Averse: reluctant, disinclined

Atrophy: waste away, degenerate

Effervescence: bubbliness, liveliness

Impede: aid, facilitate

Inaugurate: conclude, terminate

Inert: dynamic, active

Jocular: jovial, playful

Nostalgic: sentimental, wistful

Jocular: serious, solemn

Perfunctory: thorough, meticulous

Precarious: risky, unstable

Tenuous: strong, substantial

Usury: exploitation, loan-sharking

Valedictory: welcoming, introductory

Usury: charity, generosity

Valedictory: farewell, parting

Tenuous: fragile, flimsy