Synonyms of MONKEYS

any of various long-tailed primates (excluding the prosimians)

• MONKEY15

one who is playfully mischievous

• IMP7
• SCAMP11
• MONKEY15
• RASCAL8
• RAPSCALLION15
• SCALAWAG14
• SCALLYWAG18

play around with or alter or falsify, usually secretively or dishonestly

• TAMPER10
• FIDDLE11
• MONKEY15

do random, unplanned work or activities or spend time idly

• PUTTER8
• POTTER8
• TINKER10
• MONKEY15

Also: mess around, monkey around, muck about, muck around.