drowsy

adjective4

1. •
   Inclined to drowse; heavy with sleepiness

   • I was feeling drowsy and so decided to make a cup of coffee to try to wake myself up.
2. •
   Causing someone to fall sleep or feel sleepy; lulling; soporific.

   • It was a warm, drowsy summer afternoon.
3. •
   Boring.

   • The narrative throughout holds the reader; it Is not a drowsy book. — 1928
4. •
   Dull; stupid.

   • ... the hoofbeats of the mule made a sound as drowsy as a fly's buzz on a summer afternoon. — 1948