Vocab Builder #28

1. Obdurate - Stubbornly refusing to change one's opinion or course of action.
Synonyms: Stubborn, inflexible, unyielding.
Antonyms: Malleable, compliant, flexible.

Example: Despite the evidence presented, he remained obdurate in his decision not to invest in the project.

2. Perfidious - Deceitful and untrustworthy.
Synonyms: Treacherous, disloyal, unfaithful.
Antonyms: Loyal, faithful, trustworthy.

Example: She could not forgive her friend’s perfidious behavior after discovering the betrayal.

3. Sagacious - Having or showing keen mental discernment and good judgment; wise.
Synonyms: Wise, shrewd, astute.
Antonyms: Foolish, ignorant, naive.

Example: The sagacious old man was a source of wisdom for the entire village.

4. Ubiquitous - Present, appearing, or found everywhere.
Synonyms: Omnipresent, pervasive, widespread.
Antonyms: Rare, scarce, uncommon.

Example: The smartphone has become a ubiquitous device in modern society.

5. Vacillate - Alternate or waver between different opinions or actions; be indecisive.
Synonyms: Hesitate, waver, oscillate.
Antonyms: Decide, determine, settle.

Example: She tended to vacillate between two career choices, unsure of which path to follow.