Definify.com

Webster 1913 Edition

Adj.

Void of passion; without anger or emotion; not easily excited; calm.

“Self-contained and passionless.”

Tennyson.

Adj.

Not easily excited to anger; of a calm temper.

Void of passion.

passionless ‎(comparative more passionless, superlative most passionless)

Lacking in passion.

The lecturer had a cold, passionless approach towards his subject.

This Valentine's Day was the most passionless ever for me.