expand my vocabulary

vagary \VAY-guh-ree; vuh-GER-ee\, noun:
An extravagant, erratic, or unpredictable notion, action, or occurrence.

This thing called love was a total mystery to me, but the vagaries of passion and despair that accompanied each devotion kept my life in high drama.
—Jane Alexander, Command Performance

supposititious \suh-poz-uh-TISH-uhs\, adjective:

1. Fraudulently substituted for something else; not being what it purports to be; not genuine; spurious; counterfeit.
2. Hypothetical; supposed.

adumbrate \AD-uhm-brayt; uh-DUHM-\, transitive verb:

1. To give a sketchy or slight representation of; to outline.
2. To foreshadow in a vague way.
3. To suggest, indicate, or disclose partially.
4. To cast a shadow over; to shade; to obscure