In case you didn’t study sociolinguistics:

Extemporized – Compose, perform, or produce something such as music or a speech without preparation

Foment – Instigate or stir up (an undesirable or violent sentiment or course of action)

Inauspicious – Not conducive to success; unpromising

Insouciant – Showing a casual lack of concern; indifferent

Interlocutor – A person who takes part in a dialogue or conversation

Interstices – An intervening space, especially a very small one

Jocose – Playful or humorous

Largess – Generosity in bestowing money or gifts upon others

Liminal – Of or relating to a transitional or initial stage of a process

Obsequious – Obedient or attentive to an excessive or servile degree

Paucity – The presence of something only in small or insufficient quantities or amounts; scarcity

Peripatetic – Traveling from place to place, especially working or based in various places for relatively short periods

Sartorial – Of or relating to tailoring, clothes, or style of dress

Tendentious – Expressing or intending to promote a particular cause or point of view, especially a controversial one

Vacillate – Alternate or waver between different opinions or actions; be indecisive

Thanks Oxford.