doldrums /dolˈdrəmz/

1. Those parts of the ocean near the equator where calms and baffling winds prevail (nautical)
2. A state of inactivity or stagnation
3. Low spirits

• highlanders
• Highland fling
• Highland Games
• Highlandman
• highlands
• high-level
• high-level language
• high-level languages
• high-level waste
• high life
• high life below stairs
• highlight
• highlighted
• highlighter
• highlighters
• highlighting
• highlights
• high living
• high-lone
• high-low
• high-lows
• highly
• highly geared
• highly-seasoned
• highly-strung