1. Complaint.

2. To express grief, pain, censure, resentment, &c; to lament; to murmur; to bring a charge against.

3. To lament; to bewail.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• complanit,
• complainn,
• compainy,
• complit,
• complaning,
• cpmplaint,
• compliy,
• complane,
• complian,
• complaing,
• complaid,
• compling,
• complany,
• complaim,
• compayn,
• complating,
• commplain,
• complaice,
• complainte,
• compltion

• complains,
• complaining,
• champlain,
• compliance,
• complicated,
• compliant,
• complexify,
• complex,
• compiler,
• complying,
• compliment,
• compulsive,
• complicate,
• complexion,
• complexness,
• complainer,
• compliancy,
• compel,
• complete,
• complaisant,
• compulsion,
• complot,
• complexly,
• complicity,
• compliments,
• compelling,
• complaint,
• completing,
• complacence,
• compline,
• complin,
• completion,
• conflate,
• complement,
• complacency,
• complexity,
• complacent,
• compiling,
• complainant,
• compile,
• Complained,
• complect,
• comply.

The adverb for the word "complain" is "complainingly".

The adjective form of the word "complain" is "complaining".

The plural form of the word "complain" is "complains"

The singular form of the word "complain" is "complaint"