Unnerving

If there were a common thread between people who qualify, by popular consensus, as 'unnerving' - it must be their refusal to engage in small talk. Erasure of bullshit quotient in a conversation means the erasure of impersonal, quickie 'hooks': the foundation of so much social intercourse. When you enter a room unnerving person inhabits, you make eye contact and dive into the deep end. This implies neither dour face nor joyless conversation. What it means is that if you're unwilling to lay all your cards on the table, you might as well not be there at all.

Don't be humble with fools. Don't take pride into the presence of a master.
~From Jalaluddin Rumi's 'The Three Fish'