FEEBLE (5 letters) The crossword solutions for the term WEAK, INEFFECTUAL are LAME (4 letters) and FEEBLE (5 letters). Both of these words are used to describe someone or something that is not strong or powerful. LAME is often used to describe a person who is physically disabled or unable to walk properly, while FEEBLE is used to describe someone who is weak or lacking in strength or energy. Both words can also be used to describe something that is ineffective or inadequate.