1. In an exhaustive manner
   "we searched the files thoroughly"
   - exhaustively 
2. Completely and absolutely ('good' is sometimes used informally for 'thoroughly')
   - soundly, good

See also: thorough

• trefoil
• trefoil arch
• treillage
• trek
• trekker
• Trekkie
• trellis
• Trema
• Trematoda
• trematode
• trematode worm
• tremble
• trembler
• trembles
• trembling
• Tremella
• Tremella foliacea
• Tremella fuciformis
• Tremella lutescens
• Tremella reticulata
• Tremellaceae
• Tremellales
• tremendous
• tremendously
• tremie