Sultry (adjective)

1. Uncomfortably hot and humid; characterized by an oppressive atmosphere.
2. Sexually attractive or alluring, often in a subtle or restrained way.

Origin:

From middle english "sultry" meaning oppressive or heavy, of or resembling sultriness.

Examples:

1. The sultry summer day made it hard to breathe.
2. The sultry jazz music set the mood for the evening.
3. The sultry actress captivated her audience.
4. The sultry look in her eyes made him feel uneasy.
5. The sultry air made it hard to sleep at night.